Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4c61e2d317f089…

MALICIOUS

PDF

72.1 KB Created: 2021-09-24 14:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1427c9a76a4573da3e37a0b53fc34743 SHA-1: eb9bffd7629dc0f35431c4c6e9bf95cc1df725f8 SHA-256: 0c4c61e2d317f089b627fab3556700ea9d3569579ad8064e5bb0e0d98408bed4
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs extracted from the document point to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://infrive.ru/uplcv?utm_term=money+train+2+free+play PDF link annotation
    • http://salamatekhanevadeh.ir/ckeditor/files/files/62708942241.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021092406071573499.pdfIn PDF document text
    • https://cristalensi.com/public/File/31171306143.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145abf67d54b---73149781471.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/1914558926.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/jumizanora.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/33390954164.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/40603019333.pdfIn PDF document text
    • http://usateatop.com/_upload/files/71742984228.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7c085610228bc53b514c44a248717a0b/48146409878.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/f300f40af921325d5704330f8e07d920/84611148036.pdfIn PDF document text
    • https://tekartltd.com/upload/files/11695051337.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/1847e4a4d20a775a4866aa43ebd01879/warelifinibixububowo.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/dugemulaxekuros.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/38601000614.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/xivelexevinuwonek.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/scivj5levffisg2r5g79vubof7/34673179745.pdfIn PDF document text
    • http://sous-mama.org/userfiles/file/tisidevojiv.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/89435249072.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302f7ac30c4---wosasulewazabijisaja.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/midamekuxawibarujudafitup.pdfIn PDF document text
    • https://lesura.net/userfiles/file/85059049742.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/firelawenuburakamokarapu.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/pisemigarajipubodilo.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/tosapifinugugo.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_off0000b3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FC 10408 bytes
SHA-256: dca94cd5aaf7b25b876353bfd44c3256c96cbf6a96aaecb42f7f6c82e99d95f3
font_01_sfnt_off0000cbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBC 17812 bytes
SHA-256: 63411646fb3f2d1116d6a136edcbab21f600857779c7a7409e5d09b9549ab6c1
font_02_sfnt_off0000f921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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