Malicious PDF — malware analysis report

Static analysis result for SHA-256 d678fdf5680b444d…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 06:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90a92fad9627b476441ead6d94a5f2f6 SHA-1: 9a73079ef8f518fb670f3de28717a69efa312d08 SHA-256: d678fdf5680b444df5c2c651de4fe78336acb9b584abe2967e4f2faf381ad361
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing numerous links, many of which point to compromised WordPress sites and potentially disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of multiple PDF link farm heuristics suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/7f222ac88792ab4ee42173441610c2ef/sawese.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c855676c8c7---vorovotenudizona.pdf
    • https://bushregenerators.info/userfiles/files/pirajafinovol.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e7633bf33---koripibusagifugusaxowiwa.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b54705d1---92109569472.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d74da973a---xosotidonelevimulesij.pdf
    • http://duszek-lasu.pl/userfiles/file/31187257891.pdf
    • http://toyotarent.hk/FileData/ckfinder/files/20210708_8B51CEC4DDD8A153.pdf
    • https://smartbrand.ro/mm/file/sidaboxeruvafog.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3df245db3---18988474949.pdf
    • https://aptitudeclass.com/ckfinder/userfiles/files/53279907194.pdf
    • https://cardion.dk/gfx/fckimages/file/81520606112.pdf
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/16180786599.pdf
    • http://emmanuelmissionarybaptist.com/clients/74938/File/59443626491.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609e79eebec34---69195222387.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103b90be2d9a---wekuxudubonemoguxijaru.pdf
    • http://stlnsk.ru/uploads/file/zofevij.pdf
    • http://melinterior.ru/userfiles/files/74482267811.pdf
    • https://almuhja.net/ckfinder/userfiles/files/soxurumagaxozexo.pdf
    • https://daotaolaixesontay.com/uploads/file/10716154328.pdf
    • http://pelesiuvalymas.lt/i/File/14012852032.pdf
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/libugezimuvez.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=power+factor+correction+using+capacitor+bank+pdf
    • 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_off0000c62b.bin
96db9acf64436e9ead873c2627323342066c8c1f291af676e986c2a94c464292
pdf-font-stream PDF embedded font (sfnt) at offset 0xC62B 11168 bytes
font_01_sfnt_off0000e011.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 16792 bytes
font_02_sfnt_off0000f823.bin
0508672ddb0ab1bebbda62180c4dbb653af273f693e3871f2c1327006f132d3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 17888 bytes