Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafdb1099a2bb655…

MALICIOUS

PDF

83.5 KB Created: 2021-06-27 13:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aabcf1ffadf913096e9cc46b8f4f540f SHA-1: 171f6361bade0bf5485165dde5067316b1941275 SHA-256: cafdb1099a2bb65554ece9e76d30a6be3c556796b16ea9036b1bc0f249c14b90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6bbe4f960---44184897385.pdf
    • https://asiarsolutions.com/userfiles/file/sofukewobakujifeweg.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce20ce01648---10189109101.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160941fd6dbcb1---96462380524.pdf
    • http://fsgpj.com/upfolder/e/files/20210616225627.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9e333046---nijomufu.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a586838d1da---51257017746.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c21c161c0---52074162583.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/r13od41rmjmgrm72fgohg9qfhb/pugoxadusokuxojebemi.pdf
    • https://tolgyesvolgy.hu/userfiles/file/sinepudebenuzigem.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/v20i3bkbvaucl9cjdj787sovs5/49713451048.pdf
    • https://windsbs.biz/files/file/75459913593.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d54ce3deb---tajisiw.pdf
    • http://ros-grad.ru/fck_editor_files/files/48786772277.pdf
    • https://malabarmail.com/ckfinder/userfiles/files/47761101666.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a2cc5780dc0b831056e967600bdd4ef8/zidajugogibo.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ila52dpv31daheol9nhbgdkcig/88595199150.pdf
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/gobokedonifazeno.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608345d947135---56827016512.pdf
    • http://aps-mes.com/files/file/wepirufe.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/02ca51ed803c604212ff2cd06ea53b85/felevegezixegabor.pdf
    • http://domeinbeverdonk.be/assets/files/file/favisinitegidu.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/4k4f9ujqihqijn2bbih4fe1j02/53516597418.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/13bdfae418c613ed8bd883f7ff698b77/81748331201.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=humoring+me+definition
    • 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_off0000e0e2.bin
243fef8e912fa5909f639fac26d1ec7d2886f9663f53126c6a1818ae55a9fd2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 18320 bytes
font_01_sfnt_off00010ffa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFA 16792 bytes
font_02_sfnt_off00012811.bin
fc639cd76061d19829f952352ece7a1904a2092909d73aef97c9b8de72ac734f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12811 10412 bytes