Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6c16618435e2e6…

MALICIOUS

PDF

84.9 KB Created: 2021-07-08 02:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10a2859e8dc17711beb3f07372393cf7 SHA-1: 753e7a87c3b8113e4cc9c8aac34204be03e36e8d SHA-256: 2f6c16618435e2e6207303e319e84d610242cfce7ae6f2ceb565afb63f3f0ee2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm structure are strong indicators of a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c34607ba680---nepojalesaf.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b4a080bea0f927e460d868573857f673/55918773803.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/15e7662b838f609fb11f0205c7d164f7/3705092616.pdf
    • http://csptech.net/admin/userfiles/file/10162653309.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dd4125223---56994317832.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a95f4a2b51e---99030649554.pdf
    • http://climtech.com/files/files/moxitufuwali.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/eq9go88mj8aq1bs9avegsroco6/49901336480.pdf
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/divig.pdf
    • https://okazdedziecko.pl/_files/Media/file/91047356940.pdf
    • http://short-story.ru/upload/file/kegamisajotipusepanoro.pdf
    • http://wellfoto.cz/pictures/files/34401829891.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e919cddbfe8425818cc7708fe92dca5a/541487618.pdf
    • https://metnar.pl/web/uploads/files/lupavulezufi.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/eaqqm29q79l6jro3kvr7le8846/kurigirofibepewiwovov.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/wifogati.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d80683c36989c25acad7bd3c87930357/12129681385.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d00b2b26afe94a261502fbf710156cd9/dowiturabarikixawiguge.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3443e67e17---7573625126.pdf
    • https://nisahanpin.com/calisma2/files/uploads/40008379655.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a2296940fd2bb1c226bf8301141c5b35/51632376537.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/388d80a329da39c749b17c0085de54a9/tojuxarexeb.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+download+skillpipe+books
    • 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_off0000ea15.bin
1ffeec852cfa41f00b5572639b2a1161596b0f42932a7dc2e0dc54b8eba94d0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA15 10596 bytes
font_01_sfnt_off00010232.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 16792 bytes
font_02_sfnt_off00011a44.bin
d86a600be698e20f94306a2a94741e7f98df880e6eec1e8c01f7d43e88c2c82c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A44 16848 bytes