Malicious PDF — malware analysis report

Static analysis result for SHA-256 323828f22be6ccf2…

MALICIOUS

PDF

73.2 KB Created: 2021-09-06 05:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86c5b1f4d64190790a497dffb0b5ff9f SHA-1: 33dcfeaddfa83deea073732f9ffce35239e5e7ed SHA-256: 323828f22be6ccf2c06e4d6264d9de9b013923bc2ef80a6c4b010434a1aabf66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e0c3d6f84---26384776536.pdf
    • https://akconta.com/uploads/files/fafunevezudifaworarofeko.pdf
    • http://anhhieu.vn/hinhanh/file/gopibuviloxurezo.pdf
    • http://remaining-mc.de/userfiles/file/lasakofawofim.pdf
    • http://allprintusa.com/admin/images/file/84361194809.pdf
    • https://bednidhitraders.com/userfiles/file/71156749353.pdf
    • https://caraudioshop.ro/mm/file/bikuduladawotawi.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/23461713916.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/kp5cvojm0r1qrc1ilp6b9dq2j1/siwovatelasubenasinafox.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/8bb5472fa70469e5632f38bdf15cfe12/dilamopexaze.pdf
    • http://www.premiumimport.nl/ckfinder/userfiles/files/75589911346.pdf
    • https://tavio.ru/files/file/kewarazi.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/33da6e24d19903c5d93e6e450d2101de/mazofiluzam.pdf
    • http://colantuono.it/userfiles/files/rezetu.pdf
    • http://onfireinteriors.com/userfiles/1754442848.pdf
    • http://mxagproducts.com/upload/browse/file/povupimamufemu.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/18b970238a5f4ca0a79201756641a1bf/56204643487.pdf
    • https://astek-telem.fr/userfiles/file/sireloxewovula.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6114d4c10c35d317a3cc93b420d157fe/dupijifukopamisi.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/57230207532.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=adding+subtracting+fractions+with+unlike+denominators+worksheet+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_off0000b46f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB46F 16792 bytes
font_01_sfnt_off0000cc81.bin
33cf79ce99490a2dfb13b7e98659a04769894e744b9d5d7677baf373d9c939b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC81 18952 bytes
font_02_sfnt_off0000fc17.bin
8d309af751a06d8dc8d0aa4a73adbf3458b3171ff772860829218db616d88533		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 11464 bytes

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