Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c088d4bde103c5…

MALICIOUS

PDF

96.3 KB Created: 2021-08-09 08:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f5155c44cee215f6be3e46ae177d396 SHA-1: a48a6a5d0ec14002fa6a3be1fcf6df849e67f3e2 SHA-256: c4c088d4bde103c5a4ca21e2279842ff1ac80a579fca3b2d52fc233e38c63358
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c4f6e977e5a08cb52e44653090f72720/7694660538.pdf In PDF document text
    • http://ducthoaudio.com/upload/files/bisobozi.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/42589adc208fc8e31dad57d4f5d8d21b/jumag.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/oavfe4lb2ociun3rr09v5iddl9/70057703274.pdfIn PDF document text
    • https://naoshima-habitant.com/88202579786.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/49ad67666944408f3eecf9fedc4c99ec/99740011021.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/r8bcj2ofnavqpolllh4e72quie/puvopukulogevexev.pdfIn PDF document text
    • https://hoalavender.net/upload/files/58291255206.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/rumifitiwepojuj.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/xalarijutubomigo.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/najazuzozazawoleke.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/c7219cv04q67i4s80b5gjoqbe6/rosiseniwi.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/a4ed7e3f5127cdfadcbbb58235a1bb58/kewimijenuziron.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de03490e9ce---jupeberaduzuderiziba.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/walobobubonekupada.pdfIn PDF document text
    • https://ewt.cz/res/file/71873163268.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f22eb6e6a---seteletinarijazenexes.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/31844657162.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/97950680698.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f5aa2f95918fbb695f07a79f1c372c43/lemomabunilubedegi.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/61400277816.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a662751b6b---83707368308.pdfIn PDF document text
    • https://noventa.cz/media/files/file/jubademe.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/xezefavovudepiv.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/53956646457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pathfinder+kingmaker+adventure+path+reviewPDF 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_off000115da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 17100 bytes
SHA-256: 77b5ef5cf7c9d2bac9cd61a91e47b322218ea193cd689e6b3d21c0c30bd3d3fc
font_01_sfnt_off00014236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14236 10956 bytes
SHA-256: bfd706fb0337a456cd11a9ad3074ad58941f70efd3f9afad634b2786c604a6f0
font_02_sfnt_off00015b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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