Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ede7f0aaf10fffc…

MALICIOUS

PDF

115.1 KB Created: 2021-06-25 21:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92a60c16014ef54a4839d1532c96af8a SHA-1: cac607d30104a001e9142903ec54ab6c54f4819d SHA-256: 5ede7f0aaf10fffc1fe21b4006659a4194dd45d839d692deaf4362eee872ec69
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 utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user consumption but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c19151189d0---12445501179.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/85a2f8e57198f6867af2cc1e3d5c8abf/17981513764.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/85458756729.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee6c1e30b---sejiravuwepulex.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcafc3b804---mubiz.pdf
    • http://www.minaakshimajumdar.com/fckimages/file/pumafigeloxu.pdf
    • https://migger.dk/userimages/file/wemuwexanepuwufetaz.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90095da1c---43335736664.pdf
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/55329206816.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74d2e4399---31832592550.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802eb2b6d6a---firakodaborafekixaxubut.pdf
    • http://cec-intl.ru/app/webroot/files/file/68290403445.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608413d2b2bec---mezutuvotagi.pdf
    • http://twxcd.com/img-aim/files/24989557003.pdf
    • https://asset-books.com/userfiles/file/14942415947.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3a9haffrngshdksf3tnks8ghd7/kibebexivenedisabi.pdf
    • https://wodepcb.cn/uploadfiles/files/89769517498.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d59d3202cc4---fukemowa.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607357ef89878---65203641004.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9f1227157---dazizov.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608112fc70359---22498330196.pdf
    • https://aquatrustfina.com/userfiles/file/73859023818.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081619e6821e---museses.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/2h8do1363rukjr6vopjilt5f3s/pulujukufiwuxuzij.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=meaning+of+concern+in+marathi
    • 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_off00013e34.bin
313b4d1b1f982e25284d2f4e6caf7c0c7767db1f375da95b613bc7d89e59efd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E34 16064 bytes
font_01_sfnt_off0001534a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1534A 16792 bytes
font_02_sfnt_off00016b5c.bin
fdd967f402169d2186dd7725282a5016efacc5fee3bc86d3a9d7237169f59588		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B5C 22620 bytes
font_03_sfnt_off0001a6c3.bin
6b5fddb2874277a64cc9ddfea3b770f77433f462e28ffb7a49983719242678e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6C3 10560 bytes

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