Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bc34da67bba298…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 04:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 80b752a17c4422581862fc8576b2ff6f SHA-1: b9b328014f80f273f4f54fb5af7c59cbf26e47d2 SHA-256: c6bc34da67bba298504af8e29b383b2db52cfc67f1c17247097f671af49bc981
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://nissanotogovap.com/uploads/images/files/fobatonubidurikiwawa.pdf In PDF document text
    • http://csptech.net/admin/userfiles/file/puxorogepimagigijerukamo.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/28539357535.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/zonosanipiruponap.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c7f2206d67029998ff3aa8219a20713d/tosenubaxufuruvexiv.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/krm0rcnj10t6iaoqe7i0ptblqf/15730244361.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/vodebiki.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ee7gtparfm74enf7bq5lulishk/98564938929.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e028a166e9a---bogisobozepujexejaxu.pdfIn PDF document text
    • https://songhong.info/userfiles/file/jaxodevokagizomezesijix.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/jikomujurogep.pdfIn PDF document text
    • http://dalaichau.com/files/begewusuv.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/81753912578.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c0345ee4f139df0e06dbd84d8befec87/lotizogenetuvumepuziw.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/68150101079.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b33574d2acb---wosonidabojimozogebu.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/34271352726.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e23fca35f---49033224720.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a1da4db582b983a1af327f46758803b5/82560487977.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/8d92db48e0b95029877147b6c46892fc/merotig.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/jinunawineke.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/10831928809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=manual+transmission+fluid+1995+ford+rangerPDF 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_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 11144 bytes
SHA-256: c70bcaacfc0f22c3debccc0962ac0762aad3b9f52cdfd06c8c84b24cb98b7bb4
font_01_sfnt_off0000f83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83B 17860 bytes
SHA-256: 8f91bbc70d119e71b33ac425e866ecc6c7a08443ebce0481af6202325981aa1d
font_02_sfnt_off000126a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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