Malicious PDF — malware analysis report

Static analysis result for SHA-256 3344bc8c542a2952…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 05:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4283630329e1ee7b28d85b58c65de920 SHA-1: d219e28ab817e4a36985853d3159e279a80ee9ea SHA-256: 3344bc8c542a295219fded7fc6939f23fd3ed880936502a93b0d01c190e0790d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The primary goal appears to be redirecting users to external, potentially malicious 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 http://tochalco.com/uploads/files/vuropowisaridagizevo.pdf In PDF document text
    • http://randalljroutson.com/clients/44711/File/83974414129.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076d9871fbd2---masudikedufonitetububiwoz.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a17008e075a---85264706643.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/tomofeno.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/94eb9cdefa5f04dc67a4187537ea33ec/lopoponabeda.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/78754298149.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/jatux.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf0424b455---tanabapabufelose.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ls89ic833rfu75l1jkbf2ok534/zamujubeka.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/kesederur.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/muzoviwi.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/1545414504.pdfIn PDF document text
    • http://ellev.fr/upload/files/77118280320.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f1d245bd8---14092232701.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/59723421415.pdfIn PDF document text
    • http://amkchem.com/upload/files/59036929820.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501182900152197.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/c00e25f27eddaeb320d3f95554a49d16/jutuxamibogegivakobilida.pdfIn PDF document text
    • http://cmtsport.com/pliki/37094160716.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/08-26-21-20-28-15.pdfIn PDF document text
    • http://kco.su/userfiles/file/zavudozenuvinom.pdfIn PDF document text
    • http://nfc.soo.jp/file/degufatileredimemod.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/mefunubebogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+slope+of+a+line+parallel+to+the+given+line+isPDF 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_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 10664 bytes
SHA-256: 00bdd0eb600a27510457a02b9ece52d97dca548046610018cb54f3ba457ed662
font_01_sfnt_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C42 17824 bytes
SHA-256: afb26be48d9845dd1ea35b199d8fe225acd87521c94fda279889805e51083152

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