Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c8432237a4ff28…

MALICIOUS

PDF

89.3 KB Created: 2021-07-07 19:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17d84ab83bc16e25e8b5013e37f479f9 SHA-1: 3988c92622d57a5a2562575b50d6557fad3f6590 SHA-256: 86c8432237a4ff28c70a7e805461baf1baa5ba391bc7d99c23b4866b6682484d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e81dd4c811---11962628344.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/8q8lk93pujvr7euqjd9mdjv4o5/bisinupedosofuromole.pdf
    • http://kup-vino.cz/web/ckfinder/userfiles/files/51294128515.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/rsbv1ipjd2g39daosfa9ds7a2a/tapinujesaluzulopago.pdf
    • http://rdmsrl.it/userfiles/files/90777534718.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/85019726502.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072549edc335---51911324610.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc33b8d04---luxinepabedex.pdf
    • https://ebooksweb.net/files/file/61572453826.pdf
    • http://www.chatanakonci.cz/userfiles/file/36850243733.pdf
    • http://fairmonteast1969.com/clients/876766/File/rufixi.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ea6e28d9a11e528eee1cd710332c5082/jonasujirutirami.pdf
    • https://bwawarszawa.pl/upload/file/68856631065.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6bbe29e06---mowaradir.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/s51pipglq8pv1ardlcsaatc902/dobinupu.pdf
    • https://saunadlaciebie.pl/userfiles/file/77143756221.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804a497868b---boroma.pdf
    • http://maremio.ru/admin/ckfinder/userfiles/files/15270000270.pdf
    • http://trungtamdaykem.vn/Images_upload/files/mimamewaxalokin.pdf
    • http://muszempilla.com/files/file/73219676788.pdf
    • http://ricarda-allegra.de/userfiles/file/nixupokuranor.pdf
    • https://bio-obst-und-gemuese.de/userfiles/file/3074105448.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=c3+c4+muscle+innervation
    • 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_off0000fb48.bin
a627c266f9eb39f605fb190e4cc9efdca4925f2f6acac2e4ffbd8ffeac2b8b7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 16636 bytes
font_01_sfnt_off000126cd.bin
f7fb4c0227cc1e37a43c59902ec42fba5aefad017c539af5924ede2427536c14
pdf-font-stream PDF embedded font (sfnt) at offset 0x126CD 10840 bytes
font_02_sfnt_off00013fe4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE4 16792 bytes