Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9851b7125a241d…

MALICIOUS

PDF

89.5 KB Created: 2021-07-01 14:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4136674c8d3124a4f1eb794927c73bcc SHA-1: 1b8f41001486721a6679a2191eabfafe2adc4345 SHA-256: 0c9851b7125a241d44316b974c701a3eee47f1621dea2247abb723592bfc7154
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lederstuhlshop.de/ckfinder/userfiles/files/39645458800.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/tlm4hi7u7nccr7ei4tgfj28pk4/vurovebaxisawafam.pdf
    • http://ibconsulting.it/userfiles/files/87208345393.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087af904a6a7---38996435040.pdf
    • http://www.tobywells.org/media/fckdir/file/79477765535.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e643c75d06---49939750760.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/4f0befb32884b09c6f6fc137023923bd/bowumiwanawixudekulimo.pdf
    • https://lacecinella.com/writable/public/userfiles/file/mukavive.pdf
    • http://videofilm-tv.ru/content/File/37076345715.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942ea31e11a---rumororedinasowasori.pdf
    • http://doyen.cc/images/upload/File/mijakawusoxosigonavugapin.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2905d0cbd3ce8694efd51c0cc8633e4b/ramidezawexotaz.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961726dce1e---17703484977.pdf
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021062816052080554.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/344797739c92cf47112ec3dd6eded696/8436725566.pdf
    • http://brenno-tojestto.pl/userfiles/file/tozuj.pdf
    • http://bjsprt.com/uploadfile/file///2021060404175199.pdf
    • https://studiovizia.com/webroot/img/content/files/nejikekerewexalozada.pdf
    • http://meadescafe.com/userfiles/file/sokadasoderemunetukas.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086918fc33c5---kolajubizomifepereriduka.pdf
    • http://instant-image.net/UserFiles/Site/File/81264297620.pdf
    • http://painttechvina.com/webroot/img/files/30069324628.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088c3e58c832---84361778355.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bb29c5f06---kevorurimomazadetinege.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a67f44e6022---nisurifuvemapu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=botticelli+map+of+hell+interactive
    • 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_off0000fab9.bin
6e61995686ad83187d6b142d657acc8dcafa24c2338ea96377a5d28acfafb672
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 16848 bytes
font_01_sfnt_off00012663.bin
f49d063546b50f55b3494729c627efec4d01d8a843ed2f94dff67ea42c73993c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12663 10696 bytes
font_02_sfnt_off00013ebd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBD 16792 bytes