Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e801fe63a49169…

MALICIOUS

PDF

97.7 KB Created: 2021-06-26 05:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77b06b1570c772b127410979ba9cbc2d SHA-1: b1e0522f60f0efd4ec9a39d3ce6726e208608a9d SHA-256: 91e801fe63a49169680f43d8e208d2aa059cbc21da512555554d81dbd8bcbf7c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple compromised CMS upload links points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mv1idvaf069a7mimka5l4g4i32/zoxapo.pdf
    • https://promobryansk.ru/userfiles/files/25610174298.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ob6rdm6o1q3s2uivla8hr15sb7/13721413186.pdf
    • https://footballsod.com/images/ck-uploads/files/72766979943.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/13637bdd1abc62542bda67f23d2da920/63839826599.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ik52lpnopred96421dvfoiq9q2/22343013414.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac4513ede7---kirisokul.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadd6bcb9e---82741760455.pdf
    • http://houselandia.ru/files/3873751281.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609046266d091---kepos.pdf
    • http://jessie.vn/images/ckeditor/files/wemubikijuxojiwebadobinuw.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/24494688546.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608706c1dbd75---89286251192.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5656a0c080---nuxububuzikami.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/04b206fa7b8a57d1ee36fb846c453b83/dosesujemav.pdf
    • https://mavibusiness.it/file/sodanitirarej.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9702f39af---wekufibivigugipowekunap.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072676ea7c99---govuzapowewelovadu.pdf
    • http://biotledlight.com/userfiles/file///8837470407.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/kisc9elee3cjnte232ro9eq77d/xalamowadolezobavukexero.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b342baa4d8e---nimosuguputejobabarami.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084213943451---60594194899.pdf
    • http://beveragesgs.com/userfiles/file/42490029242.pdf
    • http://crocepadrekolbe.it/userfiles/files/pumipef.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f6dc27fb---60854785723.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=red+magic+witchcraft
    • 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
stream_004_off000141fb.bin
a98bf76e4b4a793676ec7ab3a73d9bc70dde779687ab3a3b4a05c992fca6277f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x141FB 18884 bytes
font_00_sfnt_off0000fea8.bin
6069e17efc84daec9e28cf7234bdd6143497a80ff55d94d1bb2dbd2f7ac2478f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 10616 bytes
font_01_sfnt_off000116c2.bin
f6555fa94f5dbb297e898086c21b20cd35406b2d8b559db3f9c3a7d92c3d875a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C2 16720 bytes
font_03_sfnt_off00016147.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16147 16792 bytes

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