Malicious PDF — malware analysis report

Static analysis result for SHA-256 f091efc071836a46…

MALICIOUS

PDF

95.2 KB Created: 2021-07-13 16:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8b864f98045319d15b34c7620be8b58f SHA-1: f9af88f4b8f2c6c4ca7b1a5bbacb311b49e17c7a SHA-256: f091efc071836a465b77a7af4c6aea9c450c9600a6be9ce8185b4fc2fd241e22
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document's structure and numerous external links suggest it's designed to lure users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6493ed57---11788701134.pdf In PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/9kodmeltsab37j9p4kvktc9drg/fadekixarezowezefe.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24ec5ec9b1---zobavi.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66150c19b---20032883084.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/51015912316.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/93255732991.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/fonazewofukinop.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/763df7910cf78e3d7c9715a8a92eeef7/zobikamevetiru.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/6vp4eq3l29bece29qfj5i3fln7/wavarofazagofevijifusana.pdfIn PDF document text
    • http://www.asslar.de/downloads/32995154478.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/66178086141.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/gidasutala.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d2b8bada1a2fd51d476ed623008c52ac/53674433103.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0403f4a16e---98765350485.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/rowukeka.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/lesuxumepuvenexufimizeval.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969b0e51e97---punuxulujisuxatexilexopim.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/6a0f750d35e37750290ac45d8f3d0b7e/fefexizopix.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d29332628f29265f321437a6acfcdde1/zazudosedebuwitujup.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/xozaluvoxininibab.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/98876613158.pdfIn PDF document text
    • http://chromoink.com/updates/file/84168457800.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075fb7969d5d---daxabeles.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1eba0994d5---mewoponixusadajigosutava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cheat+in+sims+mobilePDF 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_off00011258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11258 10444 bytes
SHA-256: 8ee0ebcbddba49998e8c528dc5eb1b3b648e915678f3d8592d25addeb729d7dd
font_01_sfnt_off000129db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141ED 17460 bytes
SHA-256: 6d13a5a4d1d7543656d5987c19652665ce684f59b2332b295d1813956d30a8d8

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