Malicious PDF — malware analysis report

Static analysis result for SHA-256 165d041122c7efde…

MALICIOUS

PDF

83.6 KB Created: 2021-07-14 09:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47b26ca19cb14fe49202f3d1b051fe01 SHA-1: e6e5bf257c6aff016c8426b9e8cc89fd50561112 SHA-256: 165d041122c7efdec12b5970ca94d25436c9d964ea57611c581d2337d7e42bd7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f40dd2df0f---13171598428.pdf
    • http://attlas.center/userfiles/file/48405402975.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a97c37ab2f8---45917113215.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6i8l0m0bq8rjkqj4cq0cmqksa5/41515520268.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a3e1616e809d44df3d42c43c3e5b942a/jumivilusigowozajafima.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5e5cd393979a0514c3b9c7dfa039010b/zajitisukulaxofibi.pdf
    • http://dinskayarealty.ru/media/file/jujajorotedufuf.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0152b06a5---77473501312.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/9pgqopm1fpmdue289t73use7c1/zawifetunadok.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ne8gbbq5u02j2qgc5dfpaq6rs2/54936084624.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f19fde2b8---mavilupefemipes.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606f92524e77e---85679896252.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97c3753428---93531538648.pdf
    • http://bensonlandscape.com/editorData/file/60677420349.pdf
    • http://asbufestival.com/uploads/FCK_files/file/82017470896.pdf
    • https://eobliecky.sk/userfiles/file/koferepigijes.pdf
    • https://a2designbg.com/userfiles/file/43935888543.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098448544b55---sinububazemejagod.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/buf543tcqu45hkcndi70cmqdh2/12968650834.pdf
    • http://coreaad.com/DreamDataUpload/file/paxapow.pdf
    • https://aeternoplanning.com/ckfinder/userfiles/files/6272360962.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f63226831049e0dede46ca51ebfc7e4/fajuletesubofojam.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c70bda95993---tavogitefupud.pdf
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/79486098585.pdf
    • http://al-bandak.com/userfiles/file/lawuzoregewate.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/708a15dcd3b4d7c3b1442f5e072b625a/lurus.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=take+two+with+phineas+and+ferb
    • 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_off0000dd93.bin
45ba2d150d3707517f7747f37698296c290499e5398629bb5eb4fa819384852c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 10832 bytes
font_01_sfnt_off0000f664.bin
69804d51186a44ac05ce0a888fac9e9633053852947c86b38f26662fa07de4b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 19596 bytes
font_02_sfnt_off00012724.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12724 16792 bytes