Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b676c9869bf617f…

MALICIOUS

PDF

93.2 KB Created: 2021-09-02 15:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f23142a1ecab163e03a9886d66a75144 SHA-1: 7f5d59f88731b61c36d34a92dd4dd181ef9c23fe SHA-256: 6b676c9869bf617fc411380f37e9fd19df44c4c0d54c4671b74646889ec033e8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/0b362f9981010b5571502cfe8be45729/57198031194.pdf In PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/4f2f9291b10f8f9d8f96a77cc43d5e09/galatazabu.pdfIn PDF document text
    • https://inncredel.com/uploads/85493535146.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63142b5d45---94264756695.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/nalumufetekujujajulagexu.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/06/20210616180930.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a777f8e69ad---sorusofegubopesuxofe.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/kedomajemepukev.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/nagazewanofag.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae2532acc---89297723230.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/palupidofi.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/tibaloxoxasokokumumi.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8f15e436b---libapefaxuvalizebisekol.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/ketiladuluvugazarukel.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/54380526613.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a668f9cec1a74e7946d44a246bf99c5f/57748137301.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5c472b1ed---wofujane.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/751079313.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/1501715757.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/72094686182.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1273167beed2664d9ac4392d98406aec/redefewezokufok.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/gigavuxupatanegefeximem.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/97258498828.pdfIn PDF document text
    • https://codecs.ro/images/file/nafakeriniso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=modal+verbs+worksheets+printablePDF 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_off000105b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 18112 bytes
SHA-256: 14f48226ec7f1980fb3b99f93211a0358bd323325803709d03ee584421d7bf66
font_01_sfnt_off000134a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A9 10864 bytes
SHA-256: 206cee4b736a1a34ba8f038805913b508447fc96533a36635848e68d83d925ef
font_02_sfnt_off00014d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1