Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf36a515784d560…

MALICIOUS

PDF

113.4 KB Created: 2021-07-03 11:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c60d5af22a0129d4f146aaf340a8344 SHA-1: a2664e79f84b5fe21881ae24e941b9e47a2a9013 SHA-256: 2bf36a515784d56025ba63a598228a5d37d1897a4c07e855cd2c449b9c019a23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The embedded URLs likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/94a48b0c947f4ea997b13d5049784e0a/71848727362.pdf
    • http://robwalker.net/fckupload/file/lopefejokuzolu.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29cca3905f---ruxawig.pdf
    • http://turar-mussin.com/userfiles/File/26608805446.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/4dgqqirr0v9cv7kutiuc1fclvr/fogibok.pdf
    • http://ankaser.com/userfiles/file/57144104189.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3bbdc594---xamugipikotoso.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/a83212bb51228c086def4517b1c8a0bf/darajipizepidesutawuzor.pdf
    • http://cutencuddlybreedables.com/_images/file/rodoxelitifunesitazama.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/9fc0356f004ff2ba23118ded63867598/16129944995.pdf
    • http://technology-mp.it/userfiles/files/78858115505.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbee6a8a189---jagaxanipozeponi.pdf
    • http://accessiblevehicleservices.com/userfiles/file/9553206294.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3da593b3a---3966373506.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c9f984346---60573626193.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/l8veuv67jqgt2uq9a66bou42k0/22221688787.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b893114561b---wobubinot.pdf
    • http://polletnv.be/uploads/files/wakalezazatug.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a93bc3181---xorunelen.pdf
    • http://compufoxmail.com/userfiles/file/gasutawimoxaf.pdf
    • http://speaklifeiamgreatness.com/files/files/rejebagotu.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e9cbdb2ff7baffb7c10ecb4bd9a1e1dc/luparoba.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b8097b8c9---vupimav.pdf
    • https://cambodiadriverservice.com/userfiles/file/xozadu.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8to9lc6lm6eg33k3g18a16hjjl/nulodabibu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=hypnotize+meaning+in+malay
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 16792 bytes
font_01_sfnt_off00011eed.bin
1d10bc48d9e2d55d6216ca23d4969fd6a74c85856fe8224e2f977f1fb6792346
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 5684 bytes
font_02_sfnt_off00013331.bin
9be4e48f539615d84642222039ca1c36f22db7c0661a1d948364f88b389bb2d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13331 10492 bytes
font_03_sfnt_off00014b04.bin
9031a7772a54abede173116a6517e1241131fa73eae0eba4186d7d5913711b32
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B04 26704 bytes
font_04_sfnt_off00018a93.bin
bd93fdc575287dad87d51d2b44381218a0f11ad2f0fc39670388fe8536969836
pdf-font-stream PDF embedded font (sfnt) at offset 0x18A93 24100 bytes