Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d18c6cb7af874c…

MALICIOUS

PDF

91.5 KB Created: 2021-09-01 01:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 077251a8af5eea04e0b17a9aef58b147 SHA-1: 949033b0158d8f21e551ffa422ec5cd09ab0edbe SHA-256: 14d18c6cb7af874c9ef3fda67e55fd56a51faf7ef404c121d87f64c41d4cbd76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://infrive.ru/uplcv?utm_term=how+to+mark+something+in+pdf
    • http://vinabomi.com/uploads/userfiles/file/toniwafo.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6de59fbcd---zururutuz.pdf
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/58028463763.pdf
    • http://dancedynamicsla.com/clients/38740/File/kitumepope.pdf
    • http://ruoumoc.com/upload/files/rerivitumogupovafi.pdf
    • http://ferramentabelleggia.it/public/file/47272076849.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/gbn9q68hrtliebc612s13o3p48/60465688477.pdf
    • http://agrobud.net/uploaded/file/78317614871.pdf
    • http://lapempi.nl/ckfinder/userfiles/files/69881485363.pdf
    • http://xnucleus.com/members//member_images/files/furexexefi.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160747fa385b1d---67506697065.pdf
    • http://burfel.ru/upfiles/files/daxozowokewajuvanu.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9c5834e1dee1fecadaac8a5f0b37d387/jaxanebivenidusan.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/14870129387.pdf
    • http://svazekobciorlice.cz/userfiles/file/89844929540.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/e3jngjiusql28pdj6jtjr4kvl6/vizuwukimokekixej.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11f39e531e---puxogilo.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3719a8e367---67118142158.pdf
    • http://j-club.eu/userfiles/file/dajalafam.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/41d968a63d1bce92dcc43266dc8dc733/92959769398.pdf
    • http://planet-for-events.de/userfiles/file/misagebisexuvuzitum.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d7856ace145---80792651115.pdf
    • https://bmw-zona.ru/uploads/file/80915683037.pdf
    • https://superpackeg.com/userfiles/file/xumesorofedukakuxinoz.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/6cb27cc141b0a599d382e0ac33711fa2/20263066992.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/cm4hr7u6a3909042bts9hamfj5/96065360256.pdf
    • https://mariellatriolo.it/public/file/vogeno.pdf
    • 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_off0000fc33.bin
44507e9139a93f9eb1218b9fcd78e4ceab9d79a0be1f3f6579608aa467ae5ef6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 18928 bytes
font_01_sfnt_off00012d5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5D 16792 bytes
font_02_sfnt_off00014574.bin
c1ae55d6f40dec7b91eb7fde2add9bb7ac195bff22b792e94c1cdddef56b622d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14574 11068 bytes