Malicious PDF — malware analysis report

Static analysis result for SHA-256 474a270ee0735af7…

MALICIOUS

PDF

80.7 KB Created: 2021-07-01 21:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 07468f6cd1d08f33601797042e27794d SHA-1: 54c39019698cbf4eedd004b4b716eee7878bb74f SHA-256: 474a270ee0735af77459253c21ffdc573e4910ab40df9ec426cfa04ce29cf9b3
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. No scripts were extracted, and the document body was unreadable, but the heuristic firings and numerous unknown URLs are sufficient evidence of a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16086c25ebc562---nexeguzeladadugemegonabe.pdf In PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ec4625f8e0839932b4fad613a08068bc/tidovimiwuxolumir.pdfIn PDF document text
    • http://htwy.com/upload/file/87754877031.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1ae570017dd82fb8465383d87bcaf70e/4788055412.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/d178c61916f7b46ee86f7f940b86b1c7/63986912658.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/sanexanikakulojavebepit.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/3nhl97tcqtiuaupae9lv2h8q21/texukozo.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/035d572254420595d4e002a3924ba44d/mozomekat.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/clufc2ij74miqor80ocjolft74/vixubobubi.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/55977577197.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/19c6c6f9e859ff1cafa7358c41b478fa/41320179749.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/87748053289.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/foweromitisigenibag.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/kexunovinaxumejaselop.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/57307953471.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f357e3370---74997679357.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609063aac300b---93665153111.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-14/20210514195348471831.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/zumokodoxomipufepipo.pdfIn PDF document text
    • http://tencanpowder.com/d/files/levonaja.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/nosagavuxujad.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b08a5819466---sememawubigowowoxagidawix.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2a1076e20682b004a1270a0296cc3f95/pamelivelitotaxosadafega.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/56823318663.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c160858b71182889af307bc45fdd36d4/83629249569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=parenthesis+meaning+in+teluguPDF 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_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 18828 bytes
SHA-256: ee7264d4964dde089539e8de9d741b8acf50468eb081ceb26703ee0981fc6412
font_01_sfnt_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 10536 bytes
SHA-256: f76130e6492bd3fc0a443bac7a3642d41b1d93dba2e2d036cf7efd014b462783
font_02_sfnt_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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