Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c96b6488b4ce53…

MALICIOUS

PDF

84.9 KB Created: 2021-09-04 10:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4192f37434bc8f5d90b3c33ffc7b8b2 SHA-1: 3adbf9cdcb25677c565d923444d4e761a267f093 SHA-256: b0c96b6488b4ce53dda735513174457b6217cbfd179ea6e9c510341bc3f25939
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, pointing to numerous external websites, some of which are hosted on compromised CMS uploads. The document body is heavily obfuscated and unreadable, preventing a deeper analysis of its specific content or intent beyond the link farm behavior.

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://icltindia.in/userfiles/file/99416191795.pdf In PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/74851005486.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112c1d293680---vepifubovumuxepezemuka.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/80927940717.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc139258855---40274924796.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/melovusatejofir.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/jafamos.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/25571206517.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/puxuzidogugisa.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/zineno.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d84cbc7359---nixorawukuxevuxikim.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2a76048c---17243344473.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/d1836ick6ng3liej5cpicncpp3/dapol.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c990c0a946b---kimomev.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-08-25/images/files/54463865217.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/9140970804.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c71be417d---78040748179.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i112l9bb33asjp3ng72beal7th/jodujigefemipirutij.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611c75598b0c3---jabiwuxota.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021062214260880554.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4ba069992---luwozimonuwadat.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/marusawatifoverek.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/5442611786.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/wuruwokonilukod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=arduino+switch+case+example+pdfPDF 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_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 21300 bytes
SHA-256: 4208c68f019d1c543a480fcacc432ca9d9b7dd0860a5e28f7c0725bbae7795dc
font_01_sfnt_off000113d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEA 11152 bytes
SHA-256: 8db270d8413a8be2b96806ffeb1c675f2c6b3112b65ccf33218b8244c830d35a

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