Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0f4e6be3349b31…

MALICIOUS

PDF

71.7 KB Created: 2021-09-21 02:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3050de21e7419a7b1cf759d8c6fc8a97 SHA-1: 466930a79f8672b611634eafb2a1a20a92a7aec3 SHA-256: 2c0f4e6be3349b3185fc32e708679b7061b657fb3f5fce05fc62a4f8d3178be7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or domains used for hosting malicious files. Heuristics indicate it functions as a link farm, with a high ML score and ClamAV detection confirming its malicious nature. The primary attack pattern involves luring users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=ibomma+new+movies+telugu
    • http://viquadro.com/userfiles/files/46331398981.pdf
    • https://unifor975.ca/userfiles/file/51039328789.pdf
    • https://kattliv.com/kattliv/admin/userfiles/file/jerokelimetezuladazuwalo.pdf
    • http://stonepigments.com/userfiles/file/nidukekawar.pdf
    • http://hebammenglueck.de/ckfinder/userfiles/files/rimarixilabigagopepad.pdf
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/velesa.pdf
    • https://euinsuti.ro/app/webroot/files/userfiles/files/27454890782.pdf
    • http://jingyilin.org/uploads/file/saferipe.pdf
    • http://tartak-monis.pl/tartak/images/file/buxasoburipikuxadidumami.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614876b331cea---zolibafubaresunogakilogu.pdf
    • http://www.schule.havonix.com/ckfinder/userfiles/files/97533447408.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161335ddcec6a9---ribimirunosavoponulu.pdf
    • https://mygrind.ie/userfiles/file/vagitiredom.pdf
    • http://hilimall.ae/uploads/files/pumurugerijozorewufuxevoz.pdf
    • http://energy-labels.com/userfiles/file/nawidoga.pdf
    • http://back2wood.de/userfiles/file/guzan.pdf
    • http://ephtour.com/FileData/ckfinder/files/20210914_D6E414D218C24C12.pdf
    • https://i-intelli.com/ckfinder/userfiles/files/33052333998.pdf
    • http://marasintl.com/public/ckfinderuploads/files/99452334160.pdf
    • http://oaklandscreche.ie/userfiles/files/60841070345.pdf
    • https://limadelimon.com/images/file/jinebizonibowapameri.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161367d7c22859---bagapufediwaludaju.pdf
    • https://imagebeaute.fr/userfiles/file/72946713229.pdf
    • http://gurolmumcu.com/userfiles/file/deluvawofiru.pdf
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/lebabogune.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_off0000b94f.bin
5d146523fe22bbb79feee00327fe9bf0d8964966df34f8e9d195c4f9065c9afd
pdf-font-stream PDF embedded font (sfnt) at offset 0xB94F 15468 bytes
font_01_sfnt_off0000e07a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 16792 bytes
font_02_sfnt_off0000f891.bin
93da3bff23a7f35600103910cd723e296a4e6769aff9cc4621f40a2131764738
pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 10692 bytes