Malicious PDF — malware analysis report

Static analysis result for SHA-256 271ff94c6de93bd3…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 22:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: decd2d32be4e3be747a5ca32c87a6fd0 SHA-1: a04157238cb2c3d16ccc5c43ac213212d96707d5 SHA-256: 271ff94c6de93bd3d3dc57fc3060c33bfd5930cedbbc81c1e27ea267520b1133
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in callback phishing and tech-support scams. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or scam document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://laborke.ru/uplcv?utm_term=contra+3+apk PDF link annotation
    • http://zzquansu.cn/d/files/fexoxegotasuxipibejo.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/duzufaxajerapote.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a4dcce63196edf455e83458870e3c996/69557676178.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/37528622908.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/liminoralevenesasikivuj.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/1e2p546d9cgkdoga2lnlggrge1/jiwosowuvizuvofilonun.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/77947135580.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/7603824962.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/61250399109.pdfIn PDF document text
    • http://chapelguild.com/images/usr/xizejokamivefolufazobidi.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130dbb03dbc2---21718283662.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210918080002.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/xifigeriretevokaturili.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/9a8904f6e55d21477f42c5ac563d59e8/98497479297.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/sujazoxifuvesox.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/48787383600.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/80705127795.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/bafusumuxepadizaluro.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ea40dbbed1a0fa18937219260f7585e8/komekurapu.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/57689218872.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/rotiroguzevopipumujanaji.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16146884a82617---15091199121.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/57003107915.pdfIn PDF document text
    • https://jetaime-shop.com/files/vapedejijavanumewiwex.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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 10100 bytes
SHA-256: 0204495a4f5b6f8f3d9f23a76f97a052f4012d5b8d0d11b6783a02301c0fd8a9
font_02_sfnt_off00011182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 17704 bytes
SHA-256: a04e443572c4efbffb03edff28f5aeadcf2a7a76c4a9847d02904fc4d69e5654

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