Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b78baad6e7e80b9…

MALICIOUS

PDF

69.1 KB Created: 2021-09-03 05:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78c08502002a1b6fd0192389ee36ec87 SHA-1: df58572989f5328d2a79bafe75245cdc273b68f5 SHA-256: 4b78baad6e7e80b9b66866b4cdedf0f1f008d01dbd669cb5e07334e6723758fe
154 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting domains, likely to obscure the ultimate destination and evade detection. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9130

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://cuboni.com/uploadfile/hong202108081930544131.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/85dcb27fbf1855548628335357185e84/66634168086.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/bamuwemepuselisove.pdf
    • http://prime42.ru/userfiles/files/jixidovadedewawazesulor.pdf
    • https://123natura.com/stockages/files/mobuwino.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/dc816edf94ce850d39e9794117747f87/migugolawimugolatare.pdf
    • http://seoulsquare.com/userfiles/file/nitutizap.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/nezoxewano.pdf
    • http://luyenthidhcanhsat.com/Images_upload/files/sesoturotezuxeluw.pdf
    • https://mayphotocopydogia.com/upload/files/kagazupelotis.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f0958a8b6---basezigupumijisazefunes.pdf
    • http://evevoyance.fr/adh/.-/file/43060150622.pdf
    • https://dolphinsolutions.net/ckfinder/userfiles/files/16766052410.pdf
    • https://bedandbreakfastchia.it/userfiles/file/naronajelizuravaravegu.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d0a70c454---93826183356.pdf
    • http://yaqeen-eg.com/userfiles/file/95716474843.pdf
    • https://contactfm.be/userfiles/files/49512512082.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e76bdd3f953---66664443781.pdf
    • http://elijasprojekts.lv/files/file/4436446615.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/b9omodkch37isirbbjlkg0en77/17893207226.pdf
    • http://vistobrasil.net/uploads/file/tixari.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700085353dc---30660070510.pdf
    • http://avanti-kuhni.ru/upload/files/25051707503.pdf
    • http://asiancfea.org/userfiles/file/kunavejutoleva.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=difference+between+value+chain+and+supply+chain+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_off0000db06.bin
8eebe73f3aff7369165ac7a886d6b24a86caa91b8608acaabee760fbb9300a18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 17340 bytes

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