Malicious PDF — malware analysis report

Static analysis result for SHA-256 6560258c5ce70176…

MALICIOUS

PDF

90.8 KB Created: 2021-06-26 08:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee4b02d488cf08f1f884654e647174a7 SHA-1: c813be1c4e505652c4d055a1fe9138daa10d9b97 SHA-256: 6560258c5ce70176cb2f7778e32344ad4511c6f96158fc582654ea5115ea6d18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://synerhu.ru/uplcv?utm_term=gearbox+design+project+pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5baf27cf20---maziwotavuviniwafamid.pdf
    • https://strechybenesov.cz/content/nalobefiwezeve.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/733cab4fe9a87f5a5596ee5ec7afd4fa/serisejuxenukolokokukab.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/432f5b59e11a693f73cf379b55580589/doragumuvaze.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/0tgjm91qcgd777m1v2cga7i4hl/tuxuguze.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0ef74feab---34212814208.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/ea0788ec6ee06bdead53ddf8a8c3da18/dawonesajiwotavabopedifo.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/9a8joh99nlifuhbf4n2qi8qj02/86647509768.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/e788joptu84jlkv0o9h8a73eogovdd6n/77828172434.pdf
    • https://celebicatering.com/upload/ckfinder/files/fazifunetenub.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7f121636---81197612433.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a920eeaf328---64134044620.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/359c58db0b861af16f94fe588f93132d/xamojipumutefozunu.pdf
    • http://dermalab.pl/userfiles/file/10334906586.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30334df920---13394267814.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078beaed8b10---75837458865.pdf
    • http://saptpadi.com/files/file/69569490617.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb4b6496e---74024039640.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27f3f0e444---dapeter.pdf
    • http://smflow.in/admin/uploads/file/30570234698.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/04a0de18cfca5872af35768b2f386038/bosotupekojixag.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb74e06fbd---gigivakigefuwomibaseguv.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/c348eda20c901709df53a5b34361d318/75578081158.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/80c39d615a2a2358bce7a3422aa0aa79/37836721480.pdf
    • http://meble-tk.pl/userfiles/file/44728183951.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608612830cc3b---67676214207.pdf
    • https://eseninternational.com/uploads/files/67847019182.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_off0000fd8c.bin
b8a0c7e161e11a4241cd847ab68548cb1a8ea5afa4a912c6e95155e4823c085e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8C 17644 bytes
font_01_sfnt_off00012c20.bin
c3e474651eade3f27517446c04489943747de25fc7dc1eb21b2d5188e03269fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C20 11160 bytes
font_02_sfnt_off000145ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145EC 16792 bytes

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