Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5eaa46d0fa57529…

MALICIOUS

PDF

74.6 KB Created: 2021-07-16 11:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a6c4276d1cdd035cb579f977082b067f SHA-1: d774b75e85ed468a29418a2d84948359aaed5c41 SHA-256: c5eaa46d0fa57529d8392af4542f1e5dd60c3e29ef67046801ef8fd65e9bcd6c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection further supports its classification as Pdf.Phishing.Trojan.

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://philabc.ru/uplcv?utm_term=makaton+sign+for+chicken PDF link annotation
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b415fccd78e1c95791f5b7d62ff7dde/kajolevena.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210604_7787C072FFFCCF41.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210623_C7577C559D9AC218.pdfIn PDF document text
    • https://agatanorek.com/files/file/xejevepofufojumolapux.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/0632ded1ceac52943f9aba0cf9887157/78755700406.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608550d585e52---24804639548.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b90266d0cf9---nevediwasofawovebebul.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/16217945762.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/28a83227f38bf8c678c6b01a40d6c0ef/57211225248.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/20833657907.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa1de873ce---fimemozonudetupiguvupigoj.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa7609c67d---64546933733.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/pifodibutiwituwovi.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de3e3443cab---zemaxip.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cc0d651c9---96001117285.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/tebajunudigekigam.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/6fc6c2c209011330442845637ded39f6/95841532306.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2878b6b3---ligaxotusow.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/mejojerekexuguku.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/39f1663867924c307a4fe41655a31371/42474721205.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/jujizi.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae4cd2480d---vumepego.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/3e19edd217b1639dbcaca90ff54e33b8/bepisumolu.pdfIn PDF document text
    • http://jechtinger-wein.com/jechtingen/files/78038462649.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/66973217286.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_off0000c2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 10656 bytes
SHA-256: 8ac76f1bd75c97217cce7dfc0427502eb2be3424b846f320a889fa7ddbf15549
font_02_sfnt_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 16208 bytes
SHA-256: a819ce65a4e789c2b702c65fb2106db8913b0423aca43c4dc9e69273a6c90d0b