Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1ceca7881201df…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 18:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e51d34bcf6909197561c790adde2f8c0 SHA-1: 72a65b4d7c68c5043dc653b4db52cb8dfe5606cb SHA-256: 3e1ceca7881201dfbc08cdd2ae1ca9fa6758fc68f10c56a5389bf071a3fb1a82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://crewmak.ru/uplcv?utm_term=metal+gear+solid+5+official+guide+pdf PDF link annotation
    • http://begemot-rus.com/uploadfiles/file/2021061405345273499.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/mesuromimumoba.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/97290096461.pdfIn PDF document text
    • http://groupkaishan.com/d/files/60814498648.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/73923834678.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/bamidapokisunepesubaviju.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/41266031474.pdfIn PDF document text
    • http://aps-mes.com/files/file/malewifajasarer.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/bj9j0hqiveaebm5e7oqf4bfv42/kadijarejiriko.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/jugirunakugapokonebuwaje.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/tiraxubugapisuwixewozumo.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/83476758118.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/379ae7de5ad73b2e35583b958e89c6b9/muripijitukidud.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/vokozuziz.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/1121255902.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160900aa7a5799---13705569802.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/vavem.pdfIn PDF document text
    • http://wohingltd.com/userfiles/52693347468.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/zukigezovakamerovesawiz.pdfIn PDF document text
    • http://africareview.in/userfiles/file/37551781539.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/21270296680.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607227c2ccfa1---tuxuveburerolub.pdfIn 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://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_off0000bc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5E 18232 bytes
SHA-256: 9abd54a5fcd666578c9f09da3a9e7a9cffba09ea5007b0c8d99038584b6a0cc0
font_01_sfnt_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 10920 bytes
SHA-256: 667f60eb86eb77a42ce700126b6c057c6d7836186c2486c5dd77108528bb7274

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