Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e9175a581c8e44…

MALICIOUS

PDF

79.0 KB Created: 2021-07-07 23:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9137e17143d072378cbe68a44c516157 SHA-1: 317bea5dfa00d7a44327b787a17cef3fc875ae83 SHA-256: 26e9175a581c8e442516f2108a98456675952d6997ee89b2105c31f1f7cedc71
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, a common technique for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

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://zahradysnapady.cz/soubory/files/58074517147.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a420a1d63b4---86002741470.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba4d6a2376---bekubigedej.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160852857d5bf3---94003813851.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/14384595851.pdf
    • https://tortugafilms.ca/adminfiles/file/loxedijasowuxinifodosenol.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/dpd39mp8n1ddmoe3tksjm4ordq/51102697415.pdf
    • https://apskarota.org/userfiles/file/podenagepubekev.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f8571aad3---kepeg.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/4aaa41806d675d80ff97b62b0401cf00/17986533531.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af960af1468---kugevitobipamufebizo.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/67735229723.pdf
    • https://firsatpin.com/calisma2/files/uploads/pofolajasitalatapakumoxuk.pdf
    • http://susanirvine.com/clients/82887/File/borevapereruwitapazolobem.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4c67a83a0---56767241727.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba293d80b1c---48649803767.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/pizaxebewerosemuluwava.pdf
    • http://oishisushigd.com/uploads/files/3907894052.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920a4500ccc---7644853956.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efb3dbad8e---39905128481.pdf
    • https://topclassgreenery.nl/images/file/gekudatinonusakudasavato.pdf
    • https://akapacha.com/userfiles/file/64402564551.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/569e613c544b58c76dc8d4e84230fd06/zugugudezitalodizoti.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/a56652135662741849fc8227333439a7/31122618803.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=father+and+son+removals
    • 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_off0000d242.bin
c725b974984cecaf85f8c68e8be545344fca7c780ca1b607f54db4371ff86d40
pdf-font-stream PDF embedded font (sfnt) at offset 0xD242 10464 bytes
font_01_sfnt_off0000e9da.bin
d7d9cbc9786f4fd558f9a8e94ab52858c781336a1694404957dd9e9b60f513a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 17428 bytes
font_02_sfnt_off00011789.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 16792 bytes