Malicious PDF — malware analysis report

Static analysis result for SHA-256 55717b7df3832095…

MALICIOUS

PDF

64.0 KB Created: 2021-09-18 22:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38e46d9e46727dbcf7605eb5d35cf875 SHA-1: 5407b891541eb5b134171c3920ae986e66df539d SHA-256: 55717b7df3832095150baa6da64b6cb4962db23db474fb78f44abc19234aea3c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of link farms hosted on disposable or compromised domains, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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 http://openendrep.com/userfiles/files/tixatoroxume.pdf
    • http://aedjtjdshbf.pretty-match.com/upload/files/xifibebefobabebupaboxeta.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/mk2on2u9quurrec9c0hddjum29/23865426676.pdf
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/83430618667.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130d8d324aec---56567636444.pdf
    • http://albino-pitti.com/pub_img/file/xawiliguzisori.pdf
    • https://hasekei.jp/userfiles/file/mumebumiwug.pdf
    • http://reckdance.pl/userfiles/file/kaxunatudojikukiminiz.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/bb05a6d433bc5456a05673abc4d8935a/45286412281.pdf
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210906_4EBB51CB65BF7284.pdf
    • http://dichvumucin.com/upload/ckupload/files/95009279069.pdf
    • http://h-n-s.net/userfiles/file/14344408454.pdf
    • http://foodzipo.com/uploads/userfiles/files/14909475265.pdf
    • http://kiiga.ru/userfiles/file/90695685621.pdf
    • http://dayuntang.com/assets/uploads/ckedit/files/20210905180503.pdf
    • https://tssch.in/tssch/application/admin/uploads/file/jisiroluperopasa.pdf
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91540835859.pdf
    • http://lagrupacio.cat/file/88536262163.pdf
    • https://seedomoretravel.com/files/files/95140044613.pdf
    • https://swapnauraan.com/ckfinder/userfiles/files/24579494130.pdf
    • https://alwillislifecenter.org/ckfinder/userfiles/files/57132958876.pdf
    • http://bekescsaba.varosom.hu/userfiles/files/titotubimibemova.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=upload+an+app+to+play+store
    • 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_off0000e298.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 16792 bytes

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