Malicious PDF — malware analysis report

Static analysis result for SHA-256 174f7f31fba0f879…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 05:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 83b88d4be5031989ed6700797922831c SHA-1: 6060e22b5cdd992e4c74c4c347e89955bf49551d SHA-256: 174f7f31fba0f879de18dffb0167bfcb1ad5ea08937121958a8444ad5deb3f96
216 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML and ClamAV, and exhibits characteristics of a social engineering attack. It contains a link farm pointing to compromised WordPress uploads and disposable domains, likely intended to lure users into downloading a secondary malicious PDF. The SE_CLICKFIX heuristic indicates the document may also contain instructions to bypass macro restrictions by tricking users into running commands directly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://usssecuritate.ro/userfiles/file/xasagosasuru.pdf In PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091718c8f78e---73918376637.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16095cf7569c1c---subekokirizitijanotefevi.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7cb4271f1---jifexazebubidog.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa2a36be1---ferif.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/3d421pnga5gv28bde8q0skr380/vefulanumovom.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/90299451948.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609103f5182e9---63891284648.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m0lfgnri17v2mne5ibbr6rbt52/novagunenofu.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/sijaremurepajajitujato.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/fozikexi.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/vomigowoporonid.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/sazudasixigarepewukizig.pdfPDF link annotation
    • http://hotelclinton.it/userfiles/files/91453041022.pdfIn PDF document text
    • https://toocapen.com/files/13943173931.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/penurijare.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c64601690ca---rusome.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/zupataragajodox.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/12496721165.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/nifodomegifogo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb6687881e---pilobag.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a276d7c9af6---raviwajalabinowinula.pdfIn PDF document text
    • http://landia-print.com/pdir/file/77044992562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=free+voice+recorder+for+windows+10PDF 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_off0000e005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 10468 bytes
SHA-256: d2ebaef47bf6bed8d66f7a172d83a151ace9e54762c22b31a88d276e70274682
font_02_sfnt_off0001100c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 17652 bytes
SHA-256: d451e61ea8dc2dd2fb394ef248c26c0bf02cc39cde6e7c0b020f6ea8d4c443f7

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