Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee88fc5d73cdffad…

MALICIOUS

PDF

81.0 KB Created: 2021-06-29 00:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f55a57658e9b07901aa877c4192fa31b SHA-1: d712fc379156cf9bceed11429c41acf7d82c7a7f SHA-256: ee88fc5d73cdffadda481bf85127d56f757b2d589462d2866f4849b24e029400
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. These links likely serve as a lure to redirect users to phishing pages or download further malicious content.

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 http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb79dbe29b---katuxa.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607400014bb5f---rudevegajujaj.pdf
    • https://fanaf.comarticle_ressources/file/werodiwajimus.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/0vkkctpb2vi0ebm7tgfedn0okd/gopazigeva.pdf
    • https://nutstudio.it/userfiles/file/96559393594.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e21193184---potamonikufefe.pdf
    • https://a2designbg.com/userfiles/file/38482478979.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1121e92d7b---zakipofabugunijar.pdf
    • https://baxsporthorses.com/userfiles/file/jiremoruzukep.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b946d9bba2887123ab542096710c955c/60319146026.pdf
    • http://paroissedementon.fr/upload/files/21347332934.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8b07a6eb7---5697378113.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/7d2c86a8ebe8955fae4f2908a4853b66/49977056942.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609175e5ec03d---6987644482.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/17d26da12a3a6253ac11b8bdca215f85/86276659051.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c8da812edb37905c9b6c4a2b8fb542c9/weribiwerijavarefedisepez.pdf
    • http://amphorabeautyclub.com/campannas/file/8660781173.pdf
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/xajaguwuwu.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2bf4d4a4ae713b5a59a2d9cdf79edfd9/82229451318.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fb0e652f2---tofumepewetabela.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/sevukazojorokuzixovit.pdf
    • http://vtaky.sk/media/file/67811674710.pdf
    • http://awkontrakt.pl/ckfinder/userfiles/files/19937544609.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609251fb89142---23728318747.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+many+solutions+can+a+system+of+two+linear+equations+have
    • 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_off0000d75d.bin
a2e054f139f9cee00a04701de541a35c563cf17756304ff5b26daf430153f6b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 17272 bytes
font_01_sfnt_off0001047b.bin
7c3d58b6ea5e2e7924969726a67f3ec38db9b146aac7aacb5d72cdfc5cc144b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 11104 bytes
font_02_sfnt_off00011e3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3F 16792 bytes