Malicious PDF — malware analysis report

Static analysis result for SHA-256 f607bae4a12a03e7…

MALICIOUS

PDF

63.7 KB Created: 2021-05-13 19:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ede01537185a0ed5027933780eebbfee SHA-1: 9d02a9d0fde541cb481165ad37fe8f19395d59b4 SHA-256: f607bae4a12a03e78c65632e186ef358049d651c11a3ce62ab2c65b4bdbc6041
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded links are the primary indicators of compromise, pointing to potentially malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8701

Heuristics 5

  • 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
  • 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://nepalimodelagency.com/userfiles/file/kutugezamav.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/384f31d2919917793be5f86c144bdd48/56807247988.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9f58e235ceb7e27999120eb697e5f45c/43814934611.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608560802936a---gorigudokavoxabugaj.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757e784cb26---mepizamagavexaten.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa00687a23---99653503238.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/uql73d287opeooc8hmntjus7a0/xuzenubumexelewemanexo.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/7c64ed0930094d2e9c0307243dcbdd51/50414071374.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607258ea6b0ac---69775232712.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0797a2287---64414139789.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/7061dfe78f26422847ca72f7cd96d863/17677964651.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c341206d05a3a877b073966c15a2a778/fusisaferikupata.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/222hrl4ajsc3jrljpmckfb70j9/62209053987.pdf
    • http://files.ibiza-ferien.de/file/jijidexofir.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/2ab92e25f80f9267e0352db028dd79a2/30518783926.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/0c59694dba66bde4661f09ca380b2db8/vividig.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f57a149307fa1b5e3e60415c0cb4895e/71747229188.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=half+saree+function+invitation+cards+templates
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d798.bin
4c9086f07e9967c1f7e4a9d2660007de3223ca158fea520307db04266705fa94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD798 5324 bytes

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