Malicious PDF — malware analysis report

Static analysis result for SHA-256 19488ad0d81b164b…

MALICIOUS

PDF

63.7 KB Created: 2021-09-04 11:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2cf50d62df228b2e7fb864fb97f41c7e SHA-1: f0f474ef5594f0a5fe36386f55377d3184e2681c SHA-256: 19488ad0d81b164b4a18437735300ac044ab1b9b2cc6dcefe31fd37f7dfae661
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9231

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://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/1d6ep02nenjviq0dgq27oe59lc/wejulorexobogeresawaz.pdf
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54085641929.pdf
    • https://xtrafitcoaching.com/www/images/files/juwulewuxofevimonajutatiz.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/62b8d86ac0da41dbe3296aa4eb2a61ae/20995892098.pdf
    • http://timebymtm.com/upload/files/32518085247.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4hfq0sgbi7e5b79djt4d7v9qs2/20817433347.pdf
    • https://dbjadow.pl/attachments/file/7639181322.pdf
    • http://apexibd.com/uploads/fck_uploads/file/13037370760.pdf
    • https://majubesar.net/contents/files/pejebiji.pdf
    • http://hzjksj.com/images/upload/File/90612963468.pdf
    • http://kistours.hu/userfiles/file/98283296632.pdf
    • https://ceccarmehedinti.ro/userfiles/file/dasaveboxaxatevekovodori.pdf
    • http://7seapharmtech.com/Uploadfiles/files/jumozexefu.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094478807fe6---64314765841.pdf
    • http://fotografoenricogiampieri.it/userfiles/files/regorazexewubukopowufud.pdf
    • https://k-newsletter.com/ckupload/files/wizevesaroka.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becd2a40ada---88245178663.pdf
    • https://tedvandergulik.nl/userimages/file/54974073998.pdf
    • https://asiquim.com/ckfinder/userfiles/files/28856175701.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c50d52401---todinedojojopuvatiwo.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7520956f4---22090786151.pdf
    • http://degrossier.nl/uploads/file/momofan.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/4e0jor1vi79i8h224p8invf2g4/66009779500.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/517b82982c51da8f16e8ba4065f92daa/46080121373.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=factors+affecting+labour+productivity+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c464.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC464 16792 bytes

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