Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d649ff8129acd0…

MALICIOUS

PDF

75.0 KB Created: 2021-07-22 05:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df9af7d694a966fd8a6e5b7fffbce987 SHA-1: c0ef626ad8151b5f930d0c06cd65e1c0a5edd50d SHA-256: b5d649ff8129acd0fb9aecc9fc79961a777a1395f180dbbdcb1a579f1d58d096
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URIs and the link farm structure strongly suggest an attempt to lure users to external, potentially harmful, resources.

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://agierresrl.it/userfiles/files/56641244295.pdf In PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c92efbf7d3e3e97d0c3b969c787d5ed8/devulasob.pdfIn PDF document text
    • http://charontrade.hu/data/file/fuxijemizigumenepinema.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/uanof135va471nl33kru4qj1q7/62409670083.pdfIn PDF document text
    • http://fxmeat.com/upload/file/7d6ff9b7c1fbad562248cba2b619ba7d.pdfIn PDF document text
    • http://praguetransfer.com/files/file/webosiwalatavegewukum.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210701164756332555809.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b9f99b664486c15d09f4a0c6e68a7d20/zunanotukeronikipililam.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/c19dad194c0ebef7131f8fcdbe4e5e51/86564561821.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160959cf261013---lotogovinefotaxozujifosi.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/vunow.pdfIn PDF document text
    • http://didopack.com/files/rubojosojijo.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/cf188d746bb949bb202564dd67a85002/95529062510.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/giwol.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0eef456f53fcfeb2963fb007d440e90f/92420700781.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/6bd68cb30503f2fd3f6d81978b31629a/4552502347.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/defd179b491c8c22ed223412b734b453/foxivimaruzaxiwefin.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210510125300697.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210705161606.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/91895529140.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f4927b571---79186250172.pdfIn PDF document text
    • http://omg.su/upload/File/97194123836.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/5387bcf35b5161a4d06509e004986b65/96906825353.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f2834e33aaedd2efac7143b53ce0ff36/77998083039.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb64db7a1d1---nevegidaruxatedej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=diet+and+depressionPDF 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_off0000c598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 10340 bytes
SHA-256: 42e249c95271605b6a7d5544ed7b5c79db91ac895164b04337c4f3ea2dc058f0
font_02_sfnt_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 15512 bytes
SHA-256: e2cd72451260f05500838476aeb64a12c579a8a8e6c201f3e68c7d6f3f8eb014

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