Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff16c1cb38bae03…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 04:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7f3ca4c5a6de531f8fea3fb66daa1e61 SHA-1: bd94fe401d2d6c9d21986efe9c138b7e4f1434d7 SHA-256: 8ff16c1cb38bae03e906151b324fd008379328f28a2aee9589f709d0c4152a91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Multiple heuristics indicate the PDF is part of a link farm, with URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=international+cases+in+tourism+management+pdf PDF link annotation
    • http://hcvitamin.com/webroot/img/files/bopere.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eb78a6dc7---guvaza.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/84595927197.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/71420492545.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b61f1b6d6ae89eca985f22c5d350ad66/54577114184.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f07a0c2b08f---fotazedoledoda.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/d3bf49d5ff01e55733f3ae15077dfbcf/wukapaleb.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/81026456849.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1874455cd0263284e6ffa617a870df52/43214659609.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/97e05d9936ba70333ad2c297c5a7daee/famaxopixexonawa.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/wapokikex.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/sipipewinebawen.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5f57406c1---67346257817.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/db97d8d652e12a56c8fd5db3c86143fd/sonolelafezorade.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16110c78768046---lubozokajesodazuwukoxaxu.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/35103451197.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160df6904d7272---56954516503.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607616c040820---wepazog.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/20da8b8fed45a51325641eb74100bae9/40248202789.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/48323996651.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/bigudemuguwusugariko.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/eb14203f06e38e701091d1cae4ec7e2f/pivupetanitel.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/79078986088.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/kujeropabijipigivedadisu.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_off0000e173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE173 11012 bytes
SHA-256: 7871056c8d513887fed02b34d6f132b70303d67d578aedd567c7841c54fb0223
font_01_sfnt_off0000fad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E5 18852 bytes
SHA-256: 3496df8747be55d80371766ccb793bed068f66e77a735199a641a94a69af245c