Malicious PDF — malware analysis report

Static analysis result for SHA-256 033bb3417a0f87b2…

MALICIOUS

PDF

208.6 KB Created: 2021-07-07 20:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 68ea941c0af98ebe58ef222c81a955f8 SHA-1: c56a7ebfafb33e143ae85d2dc9195e76fac1518d SHA-256: 033bb3417a0f87b29da0f1eb4d19abd5059395b472701bb569bdd24d462a0a49
166 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The heuristics reveal it uses a link farm hosted on compromised WordPress sites, combined with an SEO redirector, to lure victims into downloading further malicious content. The primary attack vector appears to be a malicious link disguised as a free download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://fenixfalt.com/userfiles/file/limonalijeb.pdf In PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c22911bc8---34202816520.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609803ab0bfa4---93172841653.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2b89eeda2c8c724566c04a0244f9a5ee/jikukevef.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/tovokasajereginegowobami.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0de8574a---faxikijedigoxase.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bad9418f55a---66638914986.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/96990268282.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/60789946d12547704b2da04fcc4f048c/38177075424.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f84a80091011ab0e0ff6e4ae8d8aa218/30556872774.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/38061778965.pdfIn PDF document text
    • https://ahha.az/userfiles/file/17870906226.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/95932605168.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be447937436---78408347452.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607559ee5b010---xaranojefuxoxuv.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082f9a253612---49431173211.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/kerebufem.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c32a9367e---wufonuxesalu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/264c0cc639b2f0af387a8bacace8b823/lesimorawutoreki.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce2ead5f5---zewokani.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c5740b03b---dadovekog.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/pusavunoku.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd4b99a6e4---34298985430.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/0a8ajgfrho26358qjedh4hcij1/rufunalutegemizi.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3adc5c94---votuxegazupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=neutered+dog+swollen+scrotum+years+laterPDF link annotation
    • 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_off0002d546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D546 17400 bytes
SHA-256: 0224ebe8c380883963b6f7de4393ecc8feaa7f371580efbcc33cfe54632aad69
font_01_sfnt_off00030289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00031aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31AA0 10900 bytes
SHA-256: 3c1e3a0ec02e4815537b0baebda5bf1da8ae56f62f30068f0c8c8a012e9ee815