Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31cca2e6e9ab1fd…

MALICIOUS

PDF

84.5 KB Created: 2021-07-21 22:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fd7f0f5ad7113789b074d0255643201c SHA-1: 1dbb6a32c04fc63c28f27353ee6b3e500a6c8d26 SHA-256: f31cca2e6e9ab1fd9b4dce5e836faec39a7f6bc37314e2b8b8f6d48bc972c47f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://lovelyspa.net/ckfinder/userfiles/files/gozuzogat.pdf In PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092ed5d97f78---sogewaj.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/wonolugarurebote.pdfIn PDF document text
    • http://dentherapia.hu/files/file/20797354673.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/85734726386.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/71380547683.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160db56bc09f87---midijapogobeniwubegowosu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c530d88eeef---fidune.pdfIn PDF document text
    • http://geose.ru/userfiles/file/labulewo.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d7c52b220---18837902816.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cfa4a1532---lerawerofusakono.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/88867714e58580ecef4b236db45d03ba/tejaselijigijisitetugabef.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/xofixozakonike.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/r5juhqk1gbi6qoiqnqi85er32a/bepodakobejibozovusij.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/dojokolozuluxuwodezobaw.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/dufode.pdfIn PDF document text
    • http://dgjst.com/upfile/file/32691574700.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb722b030---fowogapivasuvado.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/91659126457.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/edj6h3fo4ab5pi58tjlbuccls0/39785402931.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/dipupenategewogigefemow.pdfIn PDF document text
    • http://novichiha.ru/pic/file/siwowobununuzar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=house+rent+agreement+format+in+tamilPDF 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_off0000e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001011a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 16640 bytes
SHA-256: c9e2705412456d2741d4d06738c7ecefe811219725daad4f421739decb2e1ae6
font_02_sfnt_off00012c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C37 10648 bytes
SHA-256: 7ec99df33694f4c5b837b906bce4fe0224b27c7a833e8ed7368dde18264643dd

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