Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6534dd42f0b47f…

MALICIOUS

PDF

86.0 KB Created: 2021-06-25 14:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc66b56beb748101fe50b8447ac921e6 SHA-1: 5200025bc55f21f1ae745be6086186b325fdbeff SHA-256: 2c6534dd42f0b47f07a7164c79b2a3628cc6964845f497a6c87e87c4251e046d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites that appear to be compromised CMS upload storage, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs are indicative of a malicious link farm designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/7b156c2723cd7e6ef3d7ec8993dd72ce/67114371853.pdf
    • https://grupo-kayros.com/userfiles/file/29065388580.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/7831905f4552385f035dfdc3555b9691/86348653599.pdf
    • https://jackyrouxmethode.com/userfiles/file/66693399503.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608418d90e872---68440182519.pdf
    • http://vivo-mebel.ru/upload/file/93781322130.pdf
    • http://www.asslar.de/downloads/vuvanelina.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/3538c751eca01b98c9378651c28774f5/tipowixawozaw.pdf
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/84671106214.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e404d4a2d---guzorimebixanudo.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858075da21d---36347685316.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a56ac34cf51---32024962343.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/j3m205brois4sfv426bqpev7oo/nuvanezuwufos.pdf
    • http://clarksville.net/wysiwygfiles/file/wojilexolekuwevigagijode.pdf
    • https://kede.org/userfiles/file/75568415922.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=nepenthes+for+beginners
    • 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_off0000f018.bin
c2861c2cc920b674b0281db8ace51e2ede4f9aca96d8c4a39d59dd1aaf8bab64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 10544 bytes
font_01_sfnt_off000107d7.bin
009bbf6259240f2db7d51fae69d9a478896234e6610390d06ae37527948ab2ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D7 16640 bytes
font_02_sfnt_off00013345.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13345 16792 bytes

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