Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e262b4d20c54ab…

MALICIOUS

PDF

89.2 KB Created: 2021-08-23 20:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c44f4c50dbf136ccfe66770af7d3fb0 SHA-1: 7937cca44adf48133ff9e01d76c58756cefe3475 SHA-256: 50e262b4d20c54abf043d91aa479aa8264368675ce5c5b2ad3b98016d59df83e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kovtec.pl/eurostyl/photos/file/wesasopapezuletites.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/e786qd80piitv0s93mqcv4s212/pevirigudumafev.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/n9f0ass0bj1j0a2j5fk6k4vqq0/gikopafigame.pdf
    • http://noithatlekhanh.com/Images_upload/files/50977032497.pdf
    • https://alutat.com/data/file/jevunerigoza.pdf
    • http://metrocars.london/survey/userfiles/files/96193604281.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/sod6e45hm3c318aq0unqmeh3h7/xejokonowademomivameru.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcef8e192f---85378181287.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/u2h7jac55bpjnpg318ekmp5bo3/junovowula.pdf
    • http://lecieldesandes.fr/ckfinder/userfiles/files/semejomakem.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/qmidlv16gal7d25sfbjd1ptbc6/lavomalebarinaduvip.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae728b6b4ca---filunipirenozila.pdf
    • https://footballsod.com/images/ck-uploads/files/45465655024.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089f73b2dd93---barowigeti.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/s8bpbomi8e00vooo90pjrabis4/saxudinebaxulod.pdf
    • http://houselandia.ru/files/34154478709.pdf
    • http://dytac.hk/userfiles/75994948858.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a497824b15a---takuwemuwiximitugi.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/2049348826.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/98037644062.pdf
    • http://cartonwrappingmachine.com/userfiles/file/gulumuw.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/a09ekf8876g2pikh7hocad9v2p/latibanukepezefofedoja.pdf
    • http://jan-fotografie.nl/upload/files/35298515633.pdf
    • http://grandinhr.eu/images/user/file/22157211921.pdf
    • https://classconnbio.com/img-jacson/files/wizen.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/vujovotibago.pdf
    • http://studiotecnicodavico.eu/userfiles/files/24683119688.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=advanced+dungeons+and+dragons+monster+manual+pdf
    • 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_off0000f72a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 16792 bytes
font_01_sfnt_off00010f41.bin
c1793668f0cad925a183c0d7b972f50e6eb154d1990b6f3e6f4a1116809d0f9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 11016 bytes
font_02_sfnt_off000128bd.bin
1bef5ed97ded2f32c3ec7f9b1bc212cd78a88157e53d5b402314db110ab614e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128BD 17312 bytes