Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb87e360a33ec25a…

MALICIOUS

PDF

86.5 KB Created: 2021-06-25 12:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 939580b8f404a17adb05ac84ca461472 SHA-1: 3df3421ab9f8b494fef6e148d077269aebfcf43f SHA-256: fb87e360a33ec25a60d369fa838a9ebb4c4ffdc5304324724b6e1cfad7079f24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=charting+after+miscarriage
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d81f1f370a65679c74c492faacf496ee/15222166927.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e14f2b1b9b71a3fd4d41dc72c4418e4d/tugadepefexujagopura.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4db41b4c6---48633577275.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fad75cb00---sawivujavosutelelipasewe.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c8d34913c---54302849860.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad80e5efcf0---97083712387.pdf
    • http://euredit-editions.com/userfiles/file/62166522517.pdf
    • http://www.allatpatikapecs.hu/images/file/12390353326.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073081b29638---55749866070.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/nruhqcvkm4mi3562vftdliagen/30099413828.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4defaa985863cac6b41e43f18993e141/gabisub.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a9ad5d183---68160304112.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/a4a0435adf17814a89714623469a18db/21261756113.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d28a96d8580---bulofogamu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec57.bin
8ae40045ded7b9eb1b18f031345941ff71af4550a2f6ab63227368b16f7b13ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 10648 bytes
font_01_sfnt_off00010495.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 16792 bytes
font_02_sfnt_off00011ca7.bin
ff64b43e02e430026fe9244be9f6845992958b221a820b6586bee53acb5d8d36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 18148 bytes

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