Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c43a9c7dba8f45c…

MALICIOUS

PDF

74.9 KB Created: 2021-09-22 15:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc79c9c1f16bf0eae189748e49eed0b7 SHA-1: a0e706f6903a1aef0469889dc3ca11d2a78ac3d0 SHA-256: 0c43a9c7dba8f45c44be0bf49853ed85b458afdc240592233b4164d5017a4b8f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection for phishing and trojan activity. It contains embedded JavaScript and numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of a callback lure heuristic further indicates a phishing or tech-support scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://gavionescodeinsa.com/userfiles/86403350602.pdf
    • https://ecohort.biz/userfiles/files/nafazufa.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16140bca25bd8c---20396592228.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c727cd358f---17223542453.pdf
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/85992251661.pdf
    • https://geelaboba.dswip.com/ci/userfiles/files/muxodugatade.pdf
    • https://astdubai.co/userfiles/files/52363943783.pdf
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/86620136827.pdf
    • https://netron.pt/app/webroot/media/files/20057377834.pdf
    • https://windsbs.biz/files/file/54987385112.pdf
    • http://friend5190.xyz/js/ckfinder/userfiles/files/80842022338.pdf
    • http://yieldpharm.com/upload/files/75198549146.pdf
    • https://bibonatura.hu/ckfinder/userfiles/files/tamisutuze.pdf
    • https://www.comperat-89.fr/ckfinder/userfiles/files/tobeven.pdf
    • http://take114.kr/FileData/ckfinder/files/20210909_F9F104C77642E77A.pdf
    • https://ferado.vn/userfiles/file/junuguda.pdf
    • https://ciiinnovationsummit.com/ci/userfiles/files/14431864493.pdf
    • https://laptopserwis.com/app/webroot/media/files/vuletupiwetuvijosegifef.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/01783304ed04932d139598ff6d82177a/53985248939.pdf
    • http://gibisch.com/files/files/2005366919.pdf
    • http://northmarking.com/userfiles/files/92084074993.pdf
    • http://przedszkolenisko.pl/userfiles/file/zawapixefidexavujid.pdf
    • http://sevoir.hu/uploads/file/gotusoz.pdf
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/wijigopewumasufewe.pdf
    • https://tasivn.com/upload/ck/files/vikore.pdf
    • http://julianina.de/upload/file/25147540344.pdf
    • http://eastcoastbiker.de/sites/default/files/file/24558898553.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=kuami+eugene+ft+kwame+yogot
    • 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_off0000be5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5E 16792 bytes
font_01_sfnt_off0000d675.bin
2aca7e9ff3d73cb69ac82b1059ac32cbf39925537307cfb14ae5aa38cd73442c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD675 10628 bytes
font_02_sfnt_off0000eed3.bin
ac5f23ca08c9d3e5dff752250999b714a75ade562becd4c91c919b008372c80c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 17900 bytes