Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f095c7767c3d396…

MALICIOUS

PDF

89.5 KB Created: 2021-06-30 10:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27238c1d19fb0f630ed433aa24987a16 SHA-1: 4242fab8ce265a2d25c380a3f72b6648f2a69799 SHA-256: 4f095c7767c3d396cc5b1ec8300f3383a066e8da62cb60df2e6502bcd71d27cf
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit kits. The presence of multiple links on disposable hosting and compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/619v27c0lfd6p2tlggv89jshvk/rerikavulazevenu.pdf
    • http://assushop.com/userfiles/assushop.com/file/54225207972.pdf
    • http://tasarimak.com/ckfinder/userfiles/files/37978859439.pdf
    • https://info-jimukyoku.jp/lot/upload/files/xalozota.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/aookbp5a1egqheatlsib19eo4e/88211093454.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7a566578b225ae00131060b51e1dce73/40730221657.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/3cea78d3abe1ff3d3a2f75f8b968b0b0/saruzajovegetozubebebev.pdf
    • https://kingdomofgodmn.org/userfiles/files/fubeb.pdf
    • http://uforoi.com/app/webroot/uploads/files/birodemerora.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a00973e1804---50916447062.pdf
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/41239875918.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/6bddf1fda78b9de990737227e7eb18c0/lanusalopajirobiromone.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbe6031afb---47038600716.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091bc52a187b---56082184950.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/93913826959.pdf
    • http://aircond.md/upload_fck/file/koxeniwip.pdf
    • http://etkindenetim.com/resimler/files/wozaxuzuwenul.pdf
    • http://4998horo.gmmwireless.com/contents/files/92421437151.pdf
    • http://www.awakohchang.com/image/upload/File/evozemawe.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/72hd030lhtk6hoa3jm289la5j0/fezedumofasatunamodoj.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160971c2a17cfe---mirowutazawejofozito.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/963daf4a267ac320ca2e8abf41720712/22910064214.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fbd2e7b7f---29206215923.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/4fd0c94ff323ca7b75c5613959e06f74/pekamatagimizurawipebano.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=edith+piaf+most+famous+songs
    • 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_off0000f6b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 16792 bytes
font_01_sfnt_off00010ec3.bin
e74fc8ce7e9000c5c9102141825d7d0d8dce4187e1f303f41d3083456590604b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC3 19012 bytes
font_02_sfnt_off00014039.bin
5184f673be970b79e118c4d3c269514b5f146c36de86c2ef2fe05f39951bb88d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14039 10752 bytes