Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5a8e3b8acbd287…

MALICIOUS

PDF

91.7 KB Created: 2021-06-24 09:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a666233200bdfeb50b647f109525ff7b SHA-1: db46f1c361f6a185ea78d88e72d6c5176ed0b068 SHA-256: be5a8e3b8acbd287223109bf869cba61f34fb6fe1fb7ac37f57644b3a25e6cfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a 'breeding calculator', indicating a deceptive pretext for directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/uplcv?utm_term=iv+breeding+calculator PDF link annotation
    • http://automsystem.com/UploadFile/file/20210612141818242.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f4e70af5211cb5d697f5b0d2831d1a5e/47766647731.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/t37rkui3g3ih59ujjatcm68i2q/22402159526.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/23f602e3effd68f9d22d0fa4b7d987b5/96746003686.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/959fbc1a63322288b2b0bae304741df6/3088004507.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/72830978600.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/32917041028.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5d5881743---repaxolamega.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/g2ni0sch0eobv1phvbpgtvgb6a/863429858.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835f813705c---dudogagunopexavapepane.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/6475595306.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160badd200c9eb---garinukevipaxobubonajabi.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/kovagisiferelewe.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/lelonizitewezifidiro.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/42086373202.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/35206413527.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/paguba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 5532 bytes
SHA-256: 179029ca170f90631111f5e656098467b79ffed065f717822014a8f71daae5d0
font_01_sfnt_off00010b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B61 5068 bytes
SHA-256: d09da1f2d2c6611756e32a2570025b5d12cda903e473385263835efd56b8387e
font_02_sfnt_off00011cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB3 14364 bytes
SHA-256: 5d56bc3adb33166ce3055b81089ff02d14f7f1a8f4332e30408960a1929623e3
font_03_sfnt_off00014a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3B 16208 bytes
SHA-256: 44e9b5a9682a5d53e64fb427a6e12fa5e8a16ce09921f39372af29b39262d85e

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