Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb54fccbe81a8c8…

MALICIOUS

PDF

81.7 KB Created: 2021-07-02 07:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8018d4cc13d1ea379546675a97b24106 SHA-1: cca55b2975dadfb03cea2d5bb91e6aa451202109 SHA-256: 8bb54fccbe81a8c8dee561d85cf32f744fc647bb6a4c5ec155eb4d7f62434a5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and heuristics indicate a malicious intent to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0h5mff0mssm3k6nc88jv989ps2/25075575261.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b912248d47---bidakava.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/matapomoperarobuk.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c770a6c8c07---bizosekiwarojufipeju.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e2872a8ee41628253a7a18638fbaa695/28526299171.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160979afe8c478---kukasolugak.pdf
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/66288242161.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/gatonowiw.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/bb21f6a27f1fa59b6c69b24c400c9a4a/podanoju.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/mt5bp56bqggkcshep4nqv86kos/88578594486.pdf
    • http://alfavit.tv/userfiles/file/6437323882.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/cfa50cadceead37f2f12580db46ebe99/nojonuxilanele.pdf
    • http://uk-finansist.ru/userfiles/file/bimefedifonifo.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098938e236d1---26598745900.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d84d81285c5---46586096941.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/31842946456.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b9bfcec2a2e6393a377541f660ea36e0/kitilodomesopexesixes.pdf
    • http://arniestribu.com/campannas/file/61124761083.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/84822625123.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723e2c9814d---27854044952.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/2c8b5ca9d3216a4c490ebc4fd1926f18/41353663085.pdf
    • http://ferrogep99.hu/static/media/file/66196669009.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=river+flows+in+you+lyrics+english+meaning
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d044.bin
15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD044 1700 bytes
font_01_sfnt_off0000d85c.bin
1ff513c7bcacb0bb865f6555a2bf340ca2d4228afdf0a0e682bcb4289f86cbf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD85C 11096 bytes
font_02_sfnt_off0000f21b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 16792 bytes
font_03_sfnt_off00010a2d.bin
12d428ef865b22a8e82f0bd0b4f8aeff452c6d1432ba27d3e4e681f121c49c8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 18008 bytes

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