Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1e9fa7a65ecf29…

MALICIOUS

PDF

100.3 KB Created: 2021-08-23 10:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: b51308de0f4ee983a808685dd37c1657 SHA-1: 0819625cbc34ab6977add96b05843fd681f93498 SHA-256: 2f1e9fa7a65ecf29afb2adb19ae87c996916f5ab95e2b01465989aab1c1e31a6
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake-CAPTCHA lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/evql432d71u7f5jibsdjt3gp71/94871942485.pdf In PDF document text
    • http://slhs1958.com/clients/18590/File/85329023316.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/vikiputefaxewi.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/luwabikudotedifiwi.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/61400493103.pdfIn PDF document text
    • https://tch.lu/files/files/fipifuji.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/zoxasigaxomegavegud.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/bogupuvol.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/heqeaueluoofbshpot9blgc3il/32272466167.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/91848014446.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/pularokix.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9c77ad182---37985382042.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/33e4e01549c7138544feaf549f21f8da/94823877003.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021071915421645.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/85599276423.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/86949040687.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/75773766045.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a243f1c5186---93212633487.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/9575197643.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adba03cbf54---lonozubojo.pdfIn PDF document text
    • https://windsbs.biz/files/file/zusonimarunila.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a07f6c9afda---kagoletonifimej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=chemical+formula+of+aluminium+oxide+by+criss+cross+methodPDF 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_off00011ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDD 19388 bytes
SHA-256: aaec7453fff966696cf231f534a62ebe201d3f6c1db94efd3cb7c07b04ab4efb
font_01_sfnt_off000150e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000168fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168FB 11228 bytes
SHA-256: c53423a53bc7b8cb2e1c44cf3250da2a5417492de56d9e0fd50306377c7a4f9f

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