Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7771888ad444ad7…

MALICIOUS

PDF

98.7 KB Created: 2021-08-18 23:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa3c5cf871b8e71057140b5287c0c9ec SHA-1: 520eecc70f6dc7f70ecf2d6766ca58c39faae64e SHA-256: a7771888ad444ad75465cee5bccb93b801953312070fb4de8d848e1ab6eea12a
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, characteristic of a link farm used to distribute malicious content or phish for credentials. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically indicates links pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6415

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://terminsk.by/pics/files/metusufo.pdf
    • http://446888.top/userfiles/file/30963542100.pdf
    • https://idealist.ro/userfiles/file/vadomur.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/4fcbc142c828147acaf7f386074b7a64/51481168928.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2382665035---nikowadojok.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609b55913aa54---44958147421.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/gejatijixonu.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c92be4e71---neresidavenoganojid.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c85d097583---mosawunitogomeja.pdf
    • https://liniagdanskzydowo.pl/files/gusiko.pdf
    • http://cravaluos.com/ckfinder/userfiles/files/legasizovemaf.pdf
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210719_044157.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b022dc7200---vifomojisekegoregikoginu.pdf
    • http://jualumnitoronto.com/editor/uploadfiles/76859779452.pdf
    • http://fanti-fitness.pl/uploads/assets/file/xutakejojurolox.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60c67c73ac---88689202932.pdf
    • https://sapporomn.com/userfiles/files/41097117816.pdf
    • https://www.terraton.com.my/ckfinder/userfiles/files/lixujolozatosebufuz.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2bd52ccc2---51555385388.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d6de4848c---ledaxomowanajituvup.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/m3n686632e60eu2m1qhmu670lc/ferubewopetolabegobum.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/km8feun5ap4bvmfrgd69p6lmec/13890182959.pdf
    • https://ludifrance.fr/userfiles/file/52567725411.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=idgam%C4%B1+misleyn+bila+%C4%9Funne+harfleri
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00016174.bin
86872ffaad7df3301173d88380e71cfb06b91a8abf1f7b02c317b6a579bab056		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16174 27981 bytes
font_00_sfnt_off00012e1c.bin
e3c558c531052abc88e193b7a838ebfa888ed9703d8b523fa4ded63d183d453b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1C 21932 bytes

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