Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2e77adf3c4e22d…

MALICIOUS

PDF

69.8 KB Created: 2021-09-06 05:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c24b6b1ebc3ab54c3ea32ed512bd4d23 SHA-1: c5b38d2c5fdb4e5d9fdc80fc148950bfe16c6b45 SHA-256: 6a2e77adf3c4e22d5ae6e6bae718c705ba7103d0d34c30efa0a6033225a84ce4
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests a potential phishing or SEO manipulation tactic to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=gel+electrophoresis+types+pdf PDF link annotation
    • http://tokyoracing.hu/userfiles/file/23238108516.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/50705442961.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/gavetezevejafobit.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/47296050136.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/jatijujowuvekunawaf.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/dinupixupomete.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/24456401668.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/81813040024.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/i83shgiptfvjvfmukb4ai07gq3/jedojaxipatojazemuni.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a5eecab511c---demomuropedikilimexeva.pdfIn PDF document text
    • http://jarosi.hu/files/file/dimowokefotopitinafa.pdfIn PDF document text
    • http://holzweiss.at/61742461476.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6dbfb0212---gumejulazegifoludexize.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/wisavevasavubow.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/15878113311.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e4c1ee7af---30238619218.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/67365014938.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f36d122f5fafa88e701d613bfbc632df/51031757327.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/51012709991.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/7m2kncg6tl4o2va9090epi1jb1/dodogagobatatoj.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d0b3b20d3---lotofakajaruza.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/80540461005.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/xipofukuzow.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/7537689501.pdfIn PDF document text
    • 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_off0000b3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EC 10604 bytes
SHA-256: 54e4a3c40ce0e7d1a16a13ab850fa3ba221a969c17d106c1e43640311662af6a
font_01_sfnt_off0000cc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC49 14652 bytes
SHA-256: ea5bf5e5e2628006b26ee83f30f413b408b523c3e1b884866eab313df2c5051a
font_02_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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