Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebed0072ed5fcc9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 00:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc4402eac2fba63c606f5be4190a9c69 SHA-1: bb6d21b68c3ade3b09993feeb482023b4cab1755 SHA-256: 4ebed0072ed5fcc96a79d91d65d4bdd1d446009bff08a0d4ca376622983e8294
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest the PDF is intended to facilitate phishing or malware distribution by redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=housefly+body+parts
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/gegobavapewupowatul.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f9c57828686---mefoxibenufatisofaletorif.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c37bc1392---63094597711.pdf
    • http://naturallabs.fr/userfiles/file/43852753523.pdf
    • https://aquafilling.com/userfiles/file/nufavofaji.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/ff2a2a40b2d86ee17fdb4bcdd880d5fa/migidigajibirimeriku.pdf
    • http://kzlo.pl/fotki/fotki/file/vabujutefelezebawenetomib.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/0hmpi1n3ptte515lndealt9dh7/tomanewosuxevemimij.pdf
    • https://channeloflove.com/ckfinder/userfiles/files/30760046738.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd47819da---kopigixajileti.pdf
    • http://garmaclima.com/uploads/ckfinder/files/faxijeg.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c800e33d5f---vemapavekoxonogopix.pdf
    • https://watosaphotography.com/app/webroot/userfiles/files/20210822_063721.pdf
    • https://auditorescr.com/ckfinder/userfiles/files/naguwotekunesej.pdf
    • http://articolo17.it/siti/usr/foto/files/viromo.pdf
    • http://1-champagne.com/blog_images/blog_/file/vixudulazuwolofekop.pdf
    • http://ptairsupply.com/userfiles/file/sezijusarazup.pdf
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/jazorowokupodaxi.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074d9c8e12be---vosilolugunezidominakorer.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/18218905702.pdf
    • https://hasekei.jp/userfiles/file/23465225722.pdf
    • http://medlab.webd.pl/upload/file/kuvomajazokerogutizowo.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_off0000d92a.bin
3c8c8eeab09fbbced9d0290378651ea14c7d4c8d9af030c75d164a898ec27455
pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 16748 bytes
font_01_sfnt_off00010435.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 16792 bytes
font_02_sfnt_off00011c4c.bin
cdcefb94e9c20a127fd82abf9e31fe75957c4c6a33aaf3ca8f7e8154722bfa87
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4C 10640 bytes