Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b103c8cc94920c…

MALICIOUS

PDF

74.4 KB Created: 2021-07-04 13:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db53954b588c2915f27f310db9becda9 SHA-1: 2731ac919405e92cd1b5e9c7e8a2221b72973a50 SHA-256: 41b103c8cc94920c1c22c7df790a0fdab5727ffce115e4352784fe95529de679
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for phishing or malware, leveraging the compromised infrastructure to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607097463228a---34377249796.pdf In PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/5f5d182be54e73ec30272afe69db2e6e/melisurakajak.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2427d03a8be8bf0af6dd4a04c89def87/51339300561.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/zenuwoxaber.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d7c6620f2---buzukuzobuwekinupinokades.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0546bb59a---govamorerodol.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210624202749.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/72619128826.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/17702506546.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/6615071229.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a1d83235b50---kofesuwoluguximakereloto.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b147c7a9f---42099513151.pdfIn PDF document text
    • https://invest.pl/userfiles/file/rubuxiz.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609095c4d009c---70031572957.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941fcb55e06---pebukijevonu.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/4870af52eb3ccdda4e08a1328e0e3964/fisen.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/88191930260.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b5e5ab6dfe28f11d6e753ca448bae08d/43651022980.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3f8099bde---80405214545.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/944978cd4496002537b04c1ad36d4abb/92317583433.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607116d32efb0---6507978134.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/62601284854.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/vavijijuzupu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823fab283fb---50590991400.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/bonemidagidivakeveke.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8c8544508dd6f121dde30325efe20719/79389171517.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac42a9972---27579428036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=west+view+family+medicinePDF 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_off0000c28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 10676 bytes
SHA-256: 1153412cedbfb3512319b96dcce89e435bec56b1e7052fd652c55067c4d06e7b
font_02_sfnt_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 16256 bytes
SHA-256: c5fcff54e04f4f7a9c37134c6047367702bf134fbbd710fa28e1f0b90ce4322d

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