Malicious PDF — malware analysis report

Static analysis result for SHA-256 48fa4236647e44dd…

MALICIOUS

PDF

64.0 KB Created: 2021-05-06 13:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5709e21502582d7fbe98b42795e7ae89 SHA-1: 5fd972b8a075f3a169726913d9edbbb159b00633 SHA-256: 48fa4236647e44ddc1dcd6d6f0148603416060101bea2887044356cf2fefb2a4
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the links and the detection as a trojan indicate a malicious intent, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9516

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/popcpga9d0563bnfk2m9j4b2n1/80279087689.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf8408c69---96841177060.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/8460ea1ce33ec7a74caf72856f1680b2/33850027407.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608500566dd14---muzoxexarizijizupubawun.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091715d4984a---22572545192.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/13766bca4df8ab18e50b934c9c689852/60299472263.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908d3c858ad---salomijijolikawadobi.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e196460baf---lopuvugeweguxuragik.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/gdr80fbcev5ll6rpg02o6vk65j/66964144779.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160936a95e3b4c---85101021615.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071ba40480a9---72870389957.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bfa08db5d---48939694374.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdb7e7831c---93048438971.pdf
    • https://festival.bg/fckeditorfiles/file/38646709756.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3b3251114---vitanojubikigenubosotawi.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/9b7161bea05f6268fd71eaa33237a80d/78218297858.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=shooting+star+emoji+android
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ce.bin
4e5bfeaf02523f44dc97b2e9c97b7b49be064b66ec97483c65b776c210a3bf13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 7600 bytes
font_01_sfnt_off0000f512.bin
c0b2ac107a0c4dc40efcf057cbb9b88218f5a1f4a2611aff69a4b3d1ecef2469		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 2916 bytes

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