Malicious PDF — malware analysis report

Static analysis result for SHA-256 d794016d48ae96f2…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 02:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a101bbc153ae4360a2d42afc99201e96 SHA-1: 1f8e349f3e163b8b9a7bacb6509168d6bde8f59c SHA-256: d794016d48ae96f2bc00e0a55395f2ef08d8efbd50d1580ade0b4e00a76c7f75
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains links to external sites, some hosted on compromised WordPress uploads, suggesting a phishing or credential harvesting attempt. The presence of a 'download button' lure further supports a malicious workflow aimed at tricking the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://ketchas.ru/uplcv?utm_term=pdf+annotation+app+surface PDF link annotation
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b0410f4c129b843d35c1dfaac65be041/42253305512.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210630_DB81931B188422F6.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ccce14f32cec2adea1f4c6195793cd1/bafepunitukejojosik.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0734ab1e1e6b6d54aa528e7ba9cdf8ba/39850800195.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/875635e722e16842a15f0b16e4a361e9/42595044788.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a33a366d493---36932815570.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fdf387c71---49682872830.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/tigudumozaxesori.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/ximozomawamixiv.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/17332fd6e73697371a94c52e6dd99379/dikuwexivepaju.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/68099920183.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/14595467756.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/dafafaxigujexusexog.pdfIn PDF document text
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/zolamexetokap.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/83665607092.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/16434331358.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/87828839842.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/88430054207.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dbefdd85201---rufiw.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/2507140164.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/26240601139.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/27356231515.pdfIn PDF document text
    • http://ks-puyuma.com/CKEdit/upload/files/64803067640.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/28936208167.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/38467441608.pdfIn PDF document text
    • 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_off0000d467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD467 17100 bytes
SHA-256: 4cb26ac5fd41bddbaa14ca350faea6133d879356b9467294f17b13192ca37e7b
font_01_sfnt_off00010109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 10668 bytes
SHA-256: 6eada539c98018ed21aa3ac442f2020444dc606bd401a6dac6f925107ff7180d
font_02_sfnt_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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