Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad9f8c7d2a56e5c…

MALICIOUS

PDF

68.8 KB Created: 2021-09-05 02:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cf2602c489e0e4a68c54eab3204c9178 SHA-1: e01beaf7085aed541989de56d38b9419c5b8108c SHA-256: 8ad9f8c7d2a56e5c4eae89c726c00b6b6bb5709e53e3cdcc7b6c3eee2d709387
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's designed as a link farm pointing to compromised WordPress sites and disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to a malicious site for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=order+of+adjectives+worksheet+grade+5+pdf PDF link annotation
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8b67dde32---89034608374.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/wuleniwusufuvuvegukikewe.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/10940981392.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f873942fd---1588506040.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/24562070918.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/guzop.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/53990024544.pdfIn PDF document text
    • https://digireg.cn/upload/vuzidomugerogutilufalupo.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/29963773962.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/40867869694.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/47806250122.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085658c1298f---litelodejate.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/014a1f078c9955a3930a4ce4f8f62d97/49758845192.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a6f4381e0---3513571775.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab62279b68c---kufasodawijapizufawomo.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca11a6efc0---65309839763.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/leruvutalib.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/pokifa.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/fefumivudafenik.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/watirepi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fea6rih6pvs420j3moao0c63s7/ravupateg.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/de98p7tvap8guo9c8gd6v7sf56/28049515718.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161050e36d5fa3---58138777180.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A4 11280 bytes
SHA-256: a2d321941dc60ccb373bf1ff0bea62e3ee5da5c70a0b8a2423aabd2615669a49
font_01_sfnt_off0000cb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 13936 bytes
SHA-256: 7a5a82b872a100a7a60497b6879640307b93454638d72aa894ba5086a079bbc4

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