Malicious PDF — malware analysis report

Static analysis result for SHA-256 07cd3a7b9afac751…

MALICIOUS

PDF

258.2 KB Created: 2021-08-01 02:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1bdd7cbd2711c06a8141c00372075bc SHA-1: feb129be8c0afd6fa6ccac7a979b7e53b61d04c7 SHA-256: 07cd3a7b9afac751c75e662777ec7d13d289f23ae80ddb963be92d29aa4c7517
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, several of which point to compromised WordPress sites used for hosting PDF files. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests these links are part of an attack chain designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9699

Heuristics 5

  • 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.
  • 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://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/7be973a6549fc4dfb19a67fac6be4288/50486782097.pdf
    • https://dentalrud.com/userfiles/file/zunupizenon.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/sagavoxexobizi.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad3afceb6bf7a940fbb112ec6b8cdbd5/retipilopofidovejixomi.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d85ab8d361e98d7e962c6f8556b8454a/14153576340.pdf
    • https://warungmimpishio2.com/contents//files/nudopiwegamobawenufonab.pdf
    • https://madopin.com/calisma2/files/uploads/98541672291.pdf
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/ripojubi.pdf
    • https://cplastik.com/data/cms/file/34973903390.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7543a17572534ccc926e8072c0517954/toxajaranigitusa.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c44e2912215---88526967708.pdf
    • http://tropo-design.com/ckfinder/userfiles/files/73400497934.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7255eda3184f369e6db533366c153ef4/34592589199.pdf
    • http://kripasec.com/userfiles/file/8640492770.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=acomaf+pdf+free
    • 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_off00039c93.bin
01464eb7d70932e2b6fe11dc4f7dd245c14a477f10f9dcfdbe467e134d5e8535		 pdf-font-stream PDF embedded font (sfnt) at offset 0x39C93 10256 bytes
font_01_sfnt_off0003b3a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3B3A2 16792 bytes
font_02_sfnt_off0003cbb4.bin
c2c4e65e81446fb4253a7094be66285e8ad45ff8cc6d6ed22c6c2586ab055654		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3CBB4 17556 bytes

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