Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e279274bef4513…

MALICIOUS

PDF

85.5 KB Created: 2021-07-03 05:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4465f1f8f08cd5b80c3feb584264bf0f SHA-1: 51f837968781957bc71629e369b9023955cff4bd SHA-256: d8e279274bef45131da8b12abf2368e7cd27152bebd894cd1fdd027d2b7bd221
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://synerhu.ru/uplcv?utm_term=remnant+from+the+ashes+starting+traits
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088089c25296---83543049558.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/603j0mtodhsj3r9729euqrn6hh/kegafaxetowovasade.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/8ds0r28mhqdlr1v71l1rb1uhv4/jorojol.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc4fcfeff---vuruvulatobuzeriki.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2c7a936b7---71628960235.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085ae240b558---74194442657.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/n9mbtirmsag63obcc51rodjbrd/45128217170.pdf
    • https://alarrabnews.com/images/content/content/file/4288504273.pdf
    • https://parklanehotel.asia/userfiles/file/puvegafenewazanonevuziraf.pdf
    • http://caopump.com/admin/userfiles/file/xodizutuguki.pdf
    • http://chiengthai.com/file_media/file_image/file/bulurilonipufewa.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/1lji7dona90li47dm3t94d24k2/25505608775.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddd12c9944---judupubewogejamufoni.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa6c288ccf---kakefazigubaj.pdf
    • https://miguktour.com/FileData/ckfinder/files/20210618_A139DCCF57E03B9B.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/hubv1vea4q2h1dngd2ccocd1p5/43799355987.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bfc99e32a---92852336240.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fec2a88e1d---xivogabojesepigafixuxa.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/bula38mg346loqsu0uvgbthq06/54641442467.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/cii91t4ic5dcn1hnj2supc0dnq/22482689270.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_off0000e92b.bin
0ac24ba64280b839efec57a54b48975ff2fa537d4ff20978750ce391f5f1e728
pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 17664 bytes
font_01_sfnt_off00011712.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 16792 bytes
font_02_sfnt_off00012f29.bin
2981f7b87f9fe83bb31e23492537dd9252c38723f6a55da702965dc4fdd2d404
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F29 10660 bytes