Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7855f079f6fcd5…

MALICIOUS

PDF

94.4 KB Created: 2021-09-03 11:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e2950196761141f0979a2b85e49e4bb SHA-1: 1bc15949c6a7977015c648b24e190ad6594c15ce SHA-256: da7855f079f6fcd5ea11266e634358c0b99ba512104e48ab5c72b842460223ab
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, specifically using invoice or payment-related language to entice users. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the download of a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nomylo.ru/uplcv?utm_term=e+payment+methods+pdf PDF link annotation
    • http://www.findvoters.com/userfiles/file/55905647122.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/81090689302.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/ad7c8173d1e8d6d21ca0d3eefdd9c9ee/rogimojonowukeju.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29674efd55---69841322030.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/415e519c8c182602030deed23a79c009/17675726031.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/23534251310.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c74b2222a1---21435296834.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4v3dg3na23gp1vdfvoh7bc2tl4/jemuligijit.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5e6e6c24b---10246461393.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/73073570515.pdfIn PDF document text
    • https://actorconseil.com/files/file/13367352266.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/647e07a76cf650c20ac40952c717382e/23511188343.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee8d7c0ec---raxijipewuteluwaruxo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efdf8b4ed6---xadimetorigofifagewutifiv.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210803_83A92555264B5BFF.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/okb7fkbr9831795o5oml1n1ibl/90252841569.pdfIn PDF document text
    • https://kenadong.com/contents//files/sezogujeta.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/32abb95149d4f150b25f37084544c388/tiwititefarenerorezowi.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/pujanubifibudejimeg.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/guwudejiri.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/pivisekopekavusakepirumi.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/67b89119293cff4b705cab37bc8576e0/90278165091.pdfIn PDF document text
    • http://espokebar.com/uploads/files/sonojeriroma.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_off00010c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2C 18532 bytes
SHA-256: 1741c0491296c91f809b05fc49050c48418c749558b9f95cc9707f1cc370e194
font_01_sfnt_off00013c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15488 10620 bytes
SHA-256: 6580de50eb9dd7373ef86903a47febce381c7de711abe3004df7bb9a290a32f0

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