Malicious PDF — malware analysis report

Static analysis result for SHA-256 215c5c5d0dcb5ac1…

MALICIOUS

PDF

80.1 KB Created: 2021-06-28 11:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b25cd3003861fbd0e8a591aa8cdf4fac SHA-1: 3ff3a2fbe651a184aaee5f9017239a485d7b0192 SHA-256: 215c5c5d0dcb5ac12ee5d32e33beded7c4ad4b64fb7cd4cc3ab79c276600a801
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent. The primary function appears to be acting as a link farm, likely to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097acc06ef2d---39501093682.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ns7f3hu6tr09jk2afvg79h7ee1/musin.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb0d0905fe---29337033623.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/kivakozu.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/1e779488aab8967d89b9d6325c69e140/jexuborazevozixuvo.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/jikumufuwebubawiwazol.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6c676f2b---60465945444.pdf
    • https://hotellemaritime.com/hotel/upload/files/xapowububi.pdf
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/fakupamixivim.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/28dc6a3a6c4ff8d1d8636c91e0cc9883/fedexirif.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4ea83f859682a482b601ede3caedd4da/petuvenizatawafonupuz.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609981768f83e---nizekolavakononi.pdf
    • http://glotecgh.com/upload/editor/file/78386886193.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cb596b386---zirukakezejarunamepu.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e241034f9---5692998348.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec378319f---19282337887.pdf
    • http://andrelandberg.com/userfiles/file/44902786303.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdf4b3168f---88349689344.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/a7fp664odjm7c1cqoas8tvmhfm/55338133492.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760107da737---fuzurirajuretexutimujol.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/122f394de4f238b3999505f65b7756c1/58888421454.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/68bc40dee21e0cc5a2e271be017581a9/90632372804.pdf
    • http://bjallstar.com/upload/file/25503677963.pdf
    • https://digireg.dk/upload/vurofenagupig.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=royal+leisure+equestrian+centre
    • 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_off0000d5b2.bin
9a93e56ba8d01fcf381ff81e5af57676c5a6f62bd241c8e1aeb496e4ec8dece7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B2 17236 bytes
font_01_sfnt_off00010295.bin
dadfe0316475ef03a27611feb8fc7ee6175bb08b567f517af254e43d7a2c4f68
pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 10628 bytes
font_02_sfnt_off00011b17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B17 16792 bytes