Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3605e902ef590de…

MALICIOUS

PDF

94.3 KB Created: 2021-07-02 05:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c6afa369367c5d70749e8846ec63db4 SHA-1: ca45c6ba8d3e336b363302cb681d8795543b845e SHA-256: f3605e902ef590dea6e7f73bf9c7d44055c220b7453a3cab3ec611803d92f9c1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e5f5e1692---12252127689.pdf
    • http://thesetnews.com/images/fckeditor/file/zapiraxodelakiz.pdf
    • http://lyjclinic.com/ckupload/files/41048933438.pdf
    • http://ehomeforeclosure.org/images/file/992979544.pdf
    • http://agrobud.net/uploaded/file/18576727237.pdf
    • http://abwalabamaave.com/uploads/files/muwulutunojofilabikin.pdf
    • https://weddingitaly.jp/images/file/suwidenerudumo.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3932b6b206ec88b10151ad2eb4d76641/80446578754.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b334798dbc8---gorabozasakipumal.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b8e03b47b0466aa653eed4ef7d51c173/fipufona.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f5b346b0---sekesugadepekogojomofamaz.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/rhlu1nbshghd20dh8pufsk6ied/2724406140.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a8178a413---sasuruvareloku.pdf
    • http://industriefotografie.ch/userfiles/files/fasujatewiwelibuvulefalet.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d4b36c6feadf894ad48eec06c314002c/lakijugaroboxoxasow.pdf
    • http://prosquash.by/data/21881594666.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccae4076e4---kewasabiketomu.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c68d4d4a85---panebadabotemuj.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091dd538c470---vizevanaxalizifazuxeda.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0981b238---rejimojurukotazudinuw.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091c289a8791---63010731706.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/eacf00667c58289d8992e07de10cc69e/93091844421.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/46991974865.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=list+the+three+key+questions+that+must+be+answered+by+all+economic+systems
    • 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_off0000f677.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 16252 bytes
font_01_sfnt_off00010c53.bin
3bc55535851d9bd3990d239b7c8a7d27803e8b4756d49f8f3f4b15c1c8332def		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 16952 bytes
font_02_sfnt_off0001384c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1384C 16792 bytes
font_03_sfnt_off00015063.bin
df598db59d8025fe6b43124f1b007b1af1b4cf93b5bd288decd4562cfc3d5731		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15063 11272 bytes

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