Malicious PDF — malware analysis report

Static analysis result for SHA-256 541bbf330bb28fce…

MALICIOUS

PDF

100.4 KB Created: 2021-08-16 03:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de39d55d34e0beb6c05244b0c1d3e7e3 SHA-1: e3920964ed2b74ee1262ece03ee7b1981bcce694 SHA-256: 541bbf330bb28fcedf2c55d972608108a81e381f0057b0487aa06e2a91c950b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. The primary attack pattern involves luring users to click these links, which likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a6e253acaeb1ea57dde861766579ed2d/22582300951.pdf
    • https://phatgiaolongan.com/upload/ckupload/files/bupapigugumazexure.pdf
    • http://baovevietnam-vnss.com/upload/file/67996246173.pdf
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/73600242912.pdf
    • https://caribemed.com/userfiles/file/53237692434.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/0c0235b6b874ea3682d7326d9749a4d8/xajiron.pdf
    • http://personnelstrategies.net/userfiles/file/13394849822.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/580bb69602f1116ff0555c189b7597c0/80263947277.pdf
    • http://piqiso.ru/userfiles/file/larokelejonolojenuzo.pdf
    • https://psfund.org/public/uploads/files/cms_files/22163688082.pdf
    • http://envigest.cz/upload/file/50990240295.pdf
    • http://fgosvo.ru/files/files/47974977948.pdf
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/u1ssdsa2oevge2so5e6ubi7eu3/47985383035.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/eieu4sbjpq9693gq7fadrvptaf/76486872121.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/kecnjdnimp4jpeqqfc8acche52/98615542246.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160786e2ed5a6a---64488145365.pdf
    • https://huanghecables.com/d/files/kutenuxu.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/7bcd31f3656699c58b79ac781bfb459f/41247941216.pdf
    • https://drsaman.com/files/21549965120.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/8kh8nl46tvi6971m4h60vhmnh2/sulerezafetadukegarusepo.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160907f4c7b392---50407830393.pdf
    • http://vlajkylevne.cz/UserFiles/File/36905774950.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/0afd6946fc54e5fd78e5420079d8a07e/jikiruzopelawozonafadawi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=simple+present+affirmative+and+negative+forms+exercises
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011df7.bin
6a35124032c696dfac81c6d1a409ffbd7b97ff9d875be9e5f95fef42f1ed38e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 11208 bytes
font_01_sfnt_off000137f8.bin
49469685907746ace5870f6c042b2e0f4ea2cceffc48df8cebd9c872d82e74a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x137F8 19900 bytes
font_02_sfnt_off00016ac7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC7 16792 bytes