Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9d93aadffd9756…

MALICIOUS

PDF

72.7 KB Created: 2021-09-11 03:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e5995f09d84aa89a95ce03b29b76b190 SHA-1: 1c3ddff8515c2714d56b180fa1636f962628aead SHA-256: 2b9d93aadffd9756de589ee64e159df853e2ff33bc9e87b820343ffa045f28c1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised websites or disposable hosting. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

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 http://china-spec.ru/userfiles/file/ludilesovofumelopus.pdf In PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8356f08a8---87569117309.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/lopugaxavogeginagisafexog.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/jepopa.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/gosudefeso.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/14c6d9b480378028cee880b49d155276/75464389572.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd975af356---28912515505.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc83a2c397---54073746340.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/tefabirututajogubejasa.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/jogazogipeki.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/zodufege.pdfIn PDF document text
    • http://canoeing.by/pics/files/92498424980.pdfIn PDF document text
    • http://farmina.ru/uploads/files/26276294218.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/pokok.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/15618002861.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/nivemowezositominevovur.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/kodamaxabulikem.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/85373207422.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/9418394162.pdfIn PDF document text
    • http://air-con.ru/upload/files/bemisax.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/dunugajewa.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/wotoxipexerutipor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=justice+league+dark+online+watchPDF 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_off0000b8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E0 10916 bytes
SHA-256: 2a20c19df9e360898e1ba313d466fd3c9b686f62b96a496b463658ee952a65be
font_01_sfnt_off0000d200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 17120 bytes
SHA-256: 831d44761eba6de948671d4cf825b9823e8c635202ffb991acb0645ce976bc56