Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f127b30dfabf60d…

MALICIOUS

PDF

82.8 KB Created: 2021-06-11 10:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b36f75ddea1398410038e67ef8b3f4b3 SHA-1: 452d3e2b30df0e573a9a615099d3fa9be31161a2 SHA-256: 1f127b30dfabf60d0b331e0ec4b991161f42d95f86dc45cc3eae49bab1d06d2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term' parameters in some URLs further supports a campaign-driven distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://inwebjor.ru/uplcv?utm_term=crictime+live+cricket+apk
    • http://bean2beenefamilytree.com/clients/60578/File/rokitunogufimu.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/44cfhm3kobi6qalhr7p2r85ah1/robomenasuj.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/740fc7f216223e6222736f88b9969c93/moduwarajafugidowakoxilik.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a61e70d80---91074391368.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5eb0d4424d544d1d12c91601ceb4d8f5/tisasewunenawop.pdf
    • http://animalscipublisher.com/files/upfiles/file/xetuwurefarufidarezikuv.pdf
    • http://fine-cottage.ru/userfiles/files/kawuwuna.pdf
    • http://pileshoppen.dk/userfiles/file/51237679503.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jhfeu4m1vo0d6fkgbkp48292g5/zigig.pdf
    • http://andrelandberg.com/userfiles/file/53295197954.pdf
    • http://hgbs.de/userfiles/file/50995570333.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609edba32a360---49146023039.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7887f0541---gumidofidazogekatok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off0000f271.bin
fdede3ab329797b8945efe19ecedccfc9c302018cc3cb83e95e76a88620f0128		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 4928 bytes
font_01_sfnt_off00010324.bin
90b167a5cb8addebe8556443aa2784328f6a0046d95b4844537069c2e3e2eb4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 11376 bytes
font_02_sfnt_off00012948.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 16204 bytes

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