Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a0b795931a2f4a…

MALICIOUS

PDF

80.0 KB Created: 2021-06-24 15:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b30635cdbe4ee139965addb581cc917c SHA-1: 377e51bcb26007fca7fef4116306c55fa43dbf82 SHA-256: 20a0b795931a2f4ae112850335457e64499997737be397a1466118eca936f936
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6748

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=student+exploration+ocean+tides+answer+key PDF link annotation
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093b4b8b8197---jezodute.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16082ba3cca482---51475051620.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081760073590---47717187501.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/4aca55d5465531e32208033e59372154/sujodemetoxiruxewida.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/sefidijak.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/c41a3501f3ee87ade2ad18d761868aad/7628198143.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/32687336730.pdfIn PDF document text
    • http://charivne.info/images/file/88313978339.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/paripobijizuvid.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2b1e8335---42650584893.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/34684532644.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609630796bb18---20993675512.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/153752f1908dd466b354bf67918bd987/66482990627.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/putokiwujalu.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/350949948277a3913cd682df971234f5/vukuvujorisawobakobeponaz.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/61792353825.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10646 5380 bytes
SHA-256: a825c4c4767ad950ae7353765a99f89304d808c8a42d49c40ede50fe12e87a1e
font_01_sfnt_off000118ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AB 10288 bytes
SHA-256: fe914420fa4f6e939d153e7271ca20c8324eb0ee8966494ac11daf460bb63b95

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