Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1d39de630b45c3…

MALICIOUS

PDF

86.4 KB Created: 2021-07-17 06:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 251989ef55510412ba6d1b814fb72b72 SHA-1: 097b983d00edcbac09e40dcfccf13c706708b6ee SHA-256: cd1d39de630b45c3309356e5f11374b35a59ea20d6df2012b61f171396e88258
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable domains, indicative of a link farm designed to distribute malicious content or phish users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/06bc3869568180abe87a749508b4c7a6/2779423773.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e823a91e341240044a989b494c17e78/faxijivifebosuxuk.pdf
    • http://absolutelyneon.com/userfiles/file/tojumomulapebuluvok.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a26bfcd29a9---lubase.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a26f3a7b54---nuwafabotosukeguveziru.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a43662c332e---lubajifijepopukaku.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/2d6bdb6ccb9748f779a61c40c9523cef/38234459451.pdf
    • https://damsindia.org/admin/uploads/file/9901576875.pdf
    • http://coming-c.com/userfiles/file/84338216241.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa53a0a3b3---zewukenovusedifavidawu.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/ct3tm720ob6c391gm08irr2u31/88142819059.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/5edde3414503d787a4d9e828d4e7db30/kajasenezopo.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079e0dedb514---19720058106.pdf
    • http://septumdent.com/img/userfiles/files/79782614177.pdf
    • http://101-games.ru/images/uploads/files/dogaroriripamerufufapok.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4aac64e0a---vipod.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094046891647---32572302451.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9700c7a5d---19927368388.pdf
    • http://divorce-difficile.fr/userfiles/file/78879263223.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087370aee77b---62451907055.pdf
    • http://surtek.biz/image/files/20150116_075554.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b3af1450b---mabexu.pdf
    • https://afayl.com/userfiles/file/58566817965.pdf
    • https://olterus.com/contents//files/widekasedope.pdf
    • https://elesud.it/img_pagine/file/kudosororewa.pdf
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/46101603606.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=abnormal+psychology+book+pdf+free+download
    • 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_off0000ed0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 16792 bytes
font_01_sfnt_off00010523.bin
63f079e1815beddeef5aeea2a9c999dd3798ab93c2fdf829be4628fad96eb10f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 11288 bytes
font_02_sfnt_off00011f2d.bin
87d3fa6343466ed08a5d86d82ea9586605b074a26be9276193b0b523d3fe43d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 17196 bytes