Malicious PDF — malware analysis report

Static analysis result for SHA-256 b606d27b74f25969…

MALICIOUS

PDF

83.8 KB Created: 2021-08-21 19:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 29f62c84c48040fa5d309570812a9c26 SHA-1: 7e27178515e7e9007891244565d6bee23ea84034 SHA-256: b606d27b74f25969352e74a761bb7877335c587a97397f3105b9ecbb9a2b61af
276 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains multiple links to external resources, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The presence of heuristics indicating a 'Clipboard command execution lure' and 'ClickFix' social engineering attack strongly suggests the document is designed to trick the user into manually executing commands, likely to download and run a secondary payload. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://asesorgubernamental.com/images/file/xejipijikumifitemaluzeben.pdf In PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116e8ca769d7---wijedemelul.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/duc91flgoirf5oho9v5mvn34mi/97912559652.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/zasorinoxuserirufebevufuf.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/53381739690.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/gisosesulawesobugisutos.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d1f5348b---14447439995.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/80468761550.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609635b4a93f4---31324041973.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc05296bee---gamisu.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/63853254296.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/6a08719e839ded455fc114b14d440e5c/kijivibilafuvuburepoxiv.pdfIn PDF document text
    • http://otczenacts.com/media/files/sebetuvanejulatopewit.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/18107660391.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611818c79b89e---3062707507.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/tebunokifiperoruso.pdfIn PDF document text
    • http://dzbnf.com/upload/file///jukoruperogujovagijuzomi.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/zazimusegobegeliki.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/3dc280016f8942d41bf4d6cd267e8615/91140769261.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56d87ebcc---7156754589.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/616cc1682d63ba830f614ba6b0d8e842/7944425962.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/4e080d2e47c31acdf88093986cab5b84/fisufotumodoxegaze.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a8352ffe4---81075761056.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/gikatezebimivasudujaro.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/c61ca05147f1582b3b5c80d0a9ad1923/bojagajutalonewateg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+do+a+factory+reset+on+windows+7+with+command+promptPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 11080 bytes
SHA-256: 7819db7f2825e2405d9a8e3564c7ca977bb7a382c2ee02362769ab0053a16ef4
font_02_sfnt_off000112dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DD 17300 bytes
SHA-256: 8d8159c04dbc1901322361748c57216ef394e033191faa59928808f97bd3e4be

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