Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4ab25e3d766d06…

MALICIOUS

PDF

73.2 KB Created: 2021-08-28 04:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: e6b7054b0b10817803a746cf354ca437 SHA-1: 359cbb0eb22d9f13ac7497a040bb781b2663de1f SHA-256: 1f4ab25e3d766d069b619360ebb5a995bbd112f8ac13b068f5ed0a0483cbf487
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. The document body is heavily obfuscated and unreadable, but the heuristics indicate it is a link farm pointing to various PDF files hosted on compromised CMS uploads and disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead the user to malicious content or initiate a fraudulent interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea0dc1fec4---26177985168.pdf In PDF document text
    • https://trungtammatnamviet.vn/upload/files/39374335513.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/momizogoxuk.pdfIn PDF document text
    • http://dc-536514926e84.632.ch/ckfinder/userfiles/files/50675863089.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/75422370151.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/9d833e88dcf17dde5f55767bffc46293/45143300351.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/36448079829.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/2036735147.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/33bfeb95fc220fe1174cf832b1130341/jomowi.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/33344219546.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/37919797851.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/gararuvarajetal.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/10550751915.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a6eb1b9d8e8e0e4a5ecab59f7278e61e/81351075951.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/juxebitofejiri.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/sopetaxamawomemepixefajo.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ued13f3l20irntdv27blmqa3hb/gumiragugoze.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607710c0e20dd---kuzaniwep.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/ludilute.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/zipatazijed.pdfIn PDF document text
    • https://fasaac.org/temp//files/54381620466.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ba8b728601aea5d757e18c99670a8a2d/85542987491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=write+the+first+4+multiples+of+8PDF 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_off0000bca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA3 16340 bytes
SHA-256: 97cbe829a367bfdb9f332370d90fddc468036eba05dfff54495d117be0566772
font_01_sfnt_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 10736 bytes
SHA-256: 0aad306c822d216ff1962be90be12bebcee5946cf84c9d05bdad44e393822eaa
font_02_sfnt_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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