Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ea5bc7a1e58048…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 17:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 373bdff8c81d1d301943134e3d84835b SHA-1: 2d077b15b97f3e683c11910ebb917f930f13df75 SHA-256: 12ea5bc7a1e580485100e7ea77ff8abd2f2498a5cab007fb9f72dd91317ed6a8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point towards a common tactic of using documents as bait to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://service-panev.com/userfiles/gukozurokotirodakasisuv.pdf In PDF document text
    • http://sva-jeanroze.com/xmedia/file/burufataterur.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2249041885---97188604277.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/51554124339.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/85378388505.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/xadolotuxeso.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/midojudotuxoxo.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161003df98cbf2---14425393924.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/adc7836e0b23ec0feaa6235aa220c82f/76905500774.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210514083411.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb4747f03c---bobosopugeg.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/97512615401.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/3738876110.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wijuxovevawoxufumomev.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/d2294dc6cdbc8460a5f128a29685d8b2/xinoda.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/muvepu.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/52076554969.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/5b0j0gtg4nafdmhqbf6nudt8lt/witikifabozusavas.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/46196571600.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/60250855266.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/duxafojisisuwut.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/jijezorogukowugajipafiz.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/u7g3bfn18eoko4gif5ntiqf62c/divobuzo.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/bdb3408f1ef9274c0de6edc6ecc7309f/rezesobutis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=skin+red+and+flaky+on+facePDF 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_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 10484 bytes
SHA-256: d1a238b553843ca44fa713805d83d6f5c0c80ee5aed9974c06bb3fe2639864f9
font_01_sfnt_off0000fbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 16992 bytes
SHA-256: 8a7285061f006a8d14fcf715c29d10fc9a84f61d88a91dd5a85e64aabb399ef4
font_02_sfnt_off000127fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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