Malicious PDF — malware analysis report

Static analysis result for SHA-256 142cd98a7c70af33…

MALICIOUS

PDF

71.0 KB Created: 2021-09-22 16:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e5449fcc497bbfe56036a1136bb5478 SHA-1: 636acad90a3778269cbcb5b3add85c5ef27a47aa SHA-256: 142cd98a7c70af33f28ed585c2724fbb24be76f81fc3973165452aaf20899fef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=my+hero+the+movie+2 PDF link annotation
    • http://taaltoetsvo.nl/userfiles/file/bizofesamijodimawiriguv.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/38379037405.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/527f1896a177239676a11f2b1c84f1f4/78244212150.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/18581332964.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/49559582803.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/gojesolil.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/18651541c1a975e183472e8c4589bdc9/vedemonakiledukidat.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/86962291279.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/lekolapametiduko.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/xetipo.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/bobilitipuwet.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210918041914.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/20387722779.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/damekuwebax.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/zarokewapu.pdfIn PDF document text
    • http://373113.linker.tw/files/nupuguwenobaxim.pdfIn PDF document text
    • https://forumsevens.com/images/file/37665797169.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/69878845266.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba82b95ea5---vumibibigosilebe.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/11874234325.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/75404322302.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/kurumosadizudinozukozinu.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_off0000b5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D2 16492 bytes
SHA-256: 06871b50cee91fba31a25fcc10558cb2db74e39c4bb539a5c9a5cbf59cdf405c
font_01_sfnt_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 10184 bytes
SHA-256: da5c129124084a5201e3047ef6b78abf166de6cfb44639c07c2ab0cf2b326033
font_02_sfnt_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1