Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6098dd38d6f261…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 19:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f574a35e8a5319c6a7cc0c3fcfa4544 SHA-1: 1185324d5d38ea7ef397832883570f5bf266508c SHA-256: 2c6098dd38d6f2612e206958ca38012bf46d1f81fc75239412773fd9cdf78ddf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links ultimately serve other PDF files, suggesting a multi-stage attack or phishing campaign designed to obscure the final payload.

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 https://wastran.ru/uplcv?utm_term=mbti+assessment+pdf PDF link annotation
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7ebca6a94f29bff63e0af0d3a1db3b2b/ragoselarume.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/wolikutoni.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/0c43efd7d0906df1286b93a6c5d09973/72525204313.pdfIn PDF document text
    • http://kasargod.net/uploads/file/49305159688.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/77924322198.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/53114523533.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/61d5660e2ad7573869bdff21462ef61d/72124513371.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/30817465760.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/68052884168.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f185433b02a3535c749e3b0d7a227ece/gebokiro.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/56471672278.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/9992f3f8bfa695f575a57f4fb32e5fd0/safowerisumoxava.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/77500860548.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c915e3233fd---8834213620.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/juxutidutisudetupinef.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109021616502603.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/62501011724.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7fbd84910---fudig.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/a23bf3e3f412ebf4b4d351785012cfb1/75424083287.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c66be1d984---taxegamalonaju.pdfIn PDF document text
    • https://bataretak.com/img/files/file/74460889198.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079283a976c0---zisev.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/xapufifujesozebokuraz.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/3523513779.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_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 10528 bytes
SHA-256: 2e785222d816269fb9ba78ace8d412bfe05ed3f226ac42f687cdfbac8321f766
font_02_sfnt_off000110a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A8 18116 bytes
SHA-256: 003162309a98efbfa6d653bff75b7b933ee5354a9621fea3ad0acd7d61ce332b

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