Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f78f776a2dbe99f…

MALICIOUS

PDF

112.8 KB Created: 2021-05-11 16:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ce43a34511ed2d4260256f24cc2a8036 SHA-1: f53e48d185686ad6df76583e48a5e1e2fd6fa28f SHA-256: 9f78f776a2dbe99f396e27484ba8e00362bcf09b87aeca2a9ee9c387fbdfc963
176 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised WordPress sites. The document body, though heavily corrupted, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a malicious intent to redirect users to potentially harmful content. The SE_CALLBACK_LURE heuristic further supports a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7552669e0---dagipexax.pdf In PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee9094659d---57552309047.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16076a4451fe80---volezubovujowuxuba.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/niwudoganamafosi.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/4440bc94fe85ca3036cc655a70f71bba/13809867399.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/21038966713.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6e45fa06fb6f682a622194303f76f08/95442230391.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/futonalanepuwifovipagana.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/vofabojopuzoveloduwal.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbef91e0da---23781663958.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ts9td4pjq2qf243o5dfpj6m559/buvubunuveporimekitajifuf.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/4f0b53b9eea126b03fd04da2816e0980/43202613567.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/10114083513.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/govurigiteneputaxasobaf.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607568f9cca21---36336937662.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=albion+online+farming+guide+2018PDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001527d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527D 5700 bytes
SHA-256: 04751b24b3771b96c7de978b1772c0dca7f29fc5f4956cd6361d87648cb471cc
font_01_sfnt_off000165cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165CB 3392 bytes
SHA-256: c9103a2542e53c6e314931bb9a69d0f8629038bcc26a798d967e6a9a36e7c61d
font_02_sfnt_off000173ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173EE 13484 bytes
SHA-256: 96114a8a33b57b0c455b2c17720b4f40fb5f05a08ab03a61ee48c6cdbeb412bc
font_03_sfnt_off0001a0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0AB 16076 bytes
SHA-256: 050cca2678d7435c270027ff58d84efa212ea3c5592871ae9bdc0d1e185112d0

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