Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d9e3b3cb827c6e…

MALICIOUS

PDF

112.7 KB Created: 2021-07-23 18:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e9f267562f1c6585b7fbec91855d86e SHA-1: 2ad64787306cc86cc35b6a139b675001096feb42 SHA-256: b6d9e3b3cb827c6ec8e0185e7f533402a42070069f02979f8865c2f36435602e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to PDF files hosted on compromised CMS uploads and disposable hosting. The presence of these links suggests an attempt to lure users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mhinflatable.com/upload/file/28438226787.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608768903d9d6---7294244118.pdf
    • http://castrolmintabolt.hu/images/upload/file/20413146350.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/02b0c769jetaeds7uslc4a7iae/48783653297.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792c2fea39a---58798902435.pdf
    • http://olympusflights.com/files/files/zofemapu.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eb4aac7f6---9193635763.pdf
    • https://xistenze.com/files/files/zemomerozegorarazomuga.pdf
    • https://atlaskvartir.ua/data/uploads/files/jufotove.pdf
    • https://www.oapublishinglondon.com/ckfinder/userfiles/files/77038227100.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bg8ldk4us7iomfn04n919gna3o/39646714923.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/861l0u4mghe3hehjtpmga39dna/riwowebolofavower.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/kjk7h6duin17c64ns4qmrpk1g2/denelugopuzil.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/njn3u1ng48bthppsk702d9kai6/97941678935.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/dimigedanatemomiwine.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bed905ba14a---bisizozozedutebikop.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/171e4780dadb6f16c9aa668801167d00/risagazuw.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6795ce3ec---tanokogagatetanotuj.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0ba599995---15250827500.pdf
    • http://hyunbulsa.org/~ewedd2/userfiles/file/10424644389.pdf
    • https://sealskinz.ru/files/file/rugotiz.pdf
    • http://ankaser.com/userfiles/file/55771071526.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=auditing+it+infrastructures+for+compliance+second+edition+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_off00014ddb.bin
0d9807c2a976090526298d8c83b4a161788c2cfbb6c0a141324e9a2cdd9de1cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDB 11044 bytes
font_01_sfnt_off00016763.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16763 16792 bytes
font_02_sfnt_off00017f75.bin
e9f64774be23dc01e3d9d431fa76b1c3eea4a3880a3df27dc887a57baf46497f
pdf-font-stream PDF embedded font (sfnt) at offset 0x17F75 20432 bytes