Malicious PDF — malware analysis report

Static analysis result for SHA-256 d453c6821c131016…

MALICIOUS

PDF

82.4 KB Created: 2021-06-28 15:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb9085cb102872f4d4fbbbe18807d041 SHA-1: f38c0ebeee9b28fe4014043a28be9afa9e2b78dd SHA-256: d453c6821c131016e9e85b49b196c7db40dd4723b4be44ca472147795a59232d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://numberonerevolution.it/file/kurototowo.pdf
    • https://monyetjoget.com/contents//files/vitirazuzu.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/96744236e825dba65ca938f33a319e65/25480496470.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jlemnremvctujg7vn4jihoh390/62417767750.pdf
    • https://hirurgija.me//files/xenopigopezaresik.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/9jpvgn1i24vn9fu6ia24jbnhdk/79622978056.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607307f3dc231---65469072004.pdf
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/bilabinoronuworisokobe.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/28075360517.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608002c464b97---92278654104.pdf
    • http://automsystem.com/UploadFile/file/20210509214855464.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3870f946a4f53d0be51cf0c316e3bdb0/taribonag.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9cbb24a66---dimudidib.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160858ddf53845---zurarowu.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/e0e3bc3fa87e85119009e66a56f5115f/puzaj.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3d9b1a1a---52394650350.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/676cdbf3198bdc6987679ad00239af84/97932923974.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2jsjiaep547r0vaucclemvh177/pujamen.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/uenagf42u9d72807k2t1irobtq/benewigogavaxapaziwati.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a3820737d---73535584398.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/cc1fde25dfcd4886dfbe508437a71eba/todamerewexezagokaluve.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/010d335204eee80381aeb2d01de9286b/79901169542.pdf
    • http://igigeothermal.jp/userfiles/file/96629987887.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=anatomical+terminology+quiz+answers
    • 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_off0000ddea.bin
3c2739e2a9d566fe4fe94c5b73c912eeb18aa6363b99b4c15411e355e7e0aff4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 17336 bytes
font_01_sfnt_off00010ac0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 16792 bytes
font_02_sfnt_off000122d7.bin
188124701ffc415521003f305db33a2898c25e8ca21ef8e8cf8ed511be5af6de
pdf-font-stream PDF embedded font (sfnt) at offset 0x122D7 11060 bytes