Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4c4bd990c05b68…

MALICIOUS

PDF

77.0 KB Created: 2021-06-26 15:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 253c83bcf823586a8472cec58e3a3220 SHA-1: 6048ce8c21261d7fec74781e4308e708f9ea1ff2 SHA-256: 3f4c4bd990c05b680cf620290446cd80bb7e1ea01dabdc8b12ae09493b04eca1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://africanresearchcenter.com/userfiles/file/13403364061.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc62ae9227---56024730077.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/bef4088fae991b931754852685631a9e/zomizoxomogabopu.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7f0a48c0---poxudawogo.pdf
    • http://hotelclinton.it/userfiles/files/45199415992.pdf
    • https://flyags.com/editorResources/file///pipawalutir.pdf
    • http://jakpaisanestate.com/images/upload/files/57052499137.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/1af484c77b28650de5e8ded37a3c4984/90070142912.pdf
    • http://stalmont.eu/userfiles/file/1598748393.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c1f1e8881---velutep.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/31329686413.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c5c649f50f19a8d761bec0cc0bd3de42/vikinokese.pdf
    • https://xn--80aaijzh9b.xn--90ae/documents/file/futopepedagujelutununik.pdf
    • http://eltonltd.ru/sites/default/files/uploads/44194767958.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/vgut9acmop5rageqlj5egnc7r1/58152450183.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/n175ka3q4oocj4v9v4a3fce4h7/bewif.pdf
    • http://besttailor.info/ckfinder/userfiles/files/78709276564.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/7d075cf0ce0a4ad5fe5e1ecbeaed5b45/5666038658.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/duzakefudes.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984ffda2c4d---62298224648.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c604d483366---13641010341.pdf
    • http://mai-colle.jp/userfiles/file/suvuponagile.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608621060a42b---32546679816.pdf
    • http://kuhomania.ru/ckfinder/userfiles/files/ratokivexofa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pdf+to+cdr+x5
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c84d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC84D 16792 bytes
font_01_sfnt_off0000e064.bin
42c8389662dd4e0b4e457fdc38dc5e8bf5a78023f51d8472a65b56013a12c763
pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 10000 bytes
font_02_sfnt_off0000f6b8.bin
343af0fd457b7fe9de4cbd59238b3a87aca344aecba0baad07deb2bf53892b29
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 18824 bytes