Malicious PDF — malware analysis report

Static analysis result for SHA-256 159a438cd8d3b388…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 19:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82032cd6aaf4af1db3333c63c208a4d2 SHA-1: 2ee6f15f41505bdb7a489e6291e0bcd44f1a6c2b SHA-256: 159a438cd8d3b388636ae5b82ac8c0c86fc8ae58f91ff6bd31b0f67d14e313de
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number for support or billing issues. The document contains embedded URLs pointing to various domains, likely part of the phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=saint+francis+xavier+church PDF link annotation
    • http://corkpotters.com/images/6577835655.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/20398780163.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/18575347114.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/kilusunumaneroku.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/o40fm0bb9tu3i7j3ppnl2eo3p2/50140996251.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/nefiguxenanepefobulupubow.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/70948211089.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/mugesivawakunenaguvine.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161482175341f9---28938357862.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/mozotosukesazugoku.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/zowodaba.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/45080989290.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/80336213253.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/derolowusuzaximal.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/wuvelufa.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a2e4d314efd237880805d1000547fa6a/59991161675.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/74486674840.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210910222051_h3jn73.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/vabewovuvagef.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/7651095399.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/53732352007.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/vivomazaviraturuga.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/jebefapezeguped.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/94644d40936121119897c593cd76e417/47080111820.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_off0000da6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 10612 bytes
SHA-256: f2cdf039c7b3abe3885c5581c733f317ba4058a76eae8e7755e5c00f382b8773
font_01_sfnt_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 18276 bytes
SHA-256: eceba6563f13e0d091e2088c7c7ee938f380990356302b599b32c425a113dd76

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