Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f64f79f12bbde16…

MALICIOUS

PDF

71.3 KB Created: 2021-09-18 09:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb049f94791c66f907c3f41af1b02232 SHA-1: 078fc285ebd6ccb8c5e72b5248d68c0d022e5b85 SHA-256: 4f64f79f12bbde1625a8775dbdfdae54077d76f4dcea90b3e4f7338650f5879c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious websites for further exploitation. The presence of these links and the overall detection suggest an attempt to lure users into clicking through to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://nomylo.ru/uplcv?utm_term=720p+tamilrockers+movies
    • http://gzwep.com/img/file/20219161392.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135bba0274f0---81511342100.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139d572c15---65538769026.pdf
    • https://duvanco.be/docs/files/zijibofenazoxixesojelufu.pdf
    • http://gamjagolla.com/uploads/files/66632871608.pdf
    • https://allmassage.net/upload/file/20210910203054.pdf
    • https://mimzyonline.com/userfiles/file/zevosixuv.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/8a621b5f30fbc49543d215500d1289aa/41860510835.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141dd0058c9f---dazilirol.pdf
    • http://saraiaser.nl/userfiles/file/nepewidefurifu.pdf
    • https://eniedu.com/data/file/20210916020621.pdf
    • https://unicon-msk.ru/data/files/fuwubagi.pdf
    • http://agama-rc.com/upload/files/bavuvitolenagojojudaxar.pdf
    • https://thaiahpa.com/flash/files/ratejaw.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613244602fe04---nazojomot.pdf
    • http://imreelectric.sk/uploads/file/30562598854.pdf
    • http://drivescuolaguida.it/userfiles/files/36362875812.pdf
    • https://cdmsig.com/ckfinder/userfiles/files/zogulonokemosonoriwibawu.pdf
    • https://oolong-dining-co.com/webroot/editor-uploads/files/gedodomipuveralilafisi.pdf
    • http://i-harmonics.com/upload/files/jaxunerozonapigurafub.pdf
    • http://weorderfood.com/uploads/files/bawupitulagedazebu.pdf
    • https://pellevah.com/upload/files/wewuna.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ede3a13e3e---rimor.pdf
    • http://laureysnv.be/uploads/files/petimi.pdf
    • https://noventa.cz/media/files/file/pofijaxixozavoti.pdf
    • https://stpeterscbs.ca/ckfinder/userfiles/files/15796567394.pdf
    • https://wct.goldcrownresort.com/magazine_files/files/8065183571.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_off0000b672.bin
847e62c846d7aa04da873954a39ff6e9a3a9fd873f0d169f81e5b52611121ee2
pdf-font-stream PDF embedded font (sfnt) at offset 0xB672 10784 bytes
font_01_sfnt_off0000cf66.bin
fbad71e25c3d61e43fc1d843fbad66725fae26708d7fd94ff5db097b2a48dd4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF66 15632 bytes
font_02_sfnt_off0000f74b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 16792 bytes