Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7280db65be76be…

MALICIOUS

PDF

66.4 KB Created: 2021-09-04 03:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2dc9f4e5dc06a363418edf7b05dd55c5 SHA-1: bb9f2f38dc9c3764d77cdb13c11ff31f671eca4d SHA-256: 4b7280db65be76bea510ef94279723a5798ec10d370c7110ef094eb85d2c0dac
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan distribution intent. While no scripts were directly extracted, the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

Heuristics 5

  • 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
  • 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://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160985845c0c90---wejotudizafogeki.pdf In PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16132bcb759447---98275786368.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/99768809432.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e69c6c991c9---legutejolume.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/jikim.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/81047861375.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/27123288919.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/ponukimanufugidojidote.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/406f0828d627d3576bd2e47208072c88/jogufagevixo.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/14993583663.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/kodotuwegimobekazojogor.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86d78b9def---dolimupavegoze.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc45470236---nasurikowadafesuxupofixuj.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/48560309634.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kifidogunesamixivenip.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e407cd05e8---44541337415.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e916bd0fc92e90057b0586984a76dff8/26069445279.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/14976613152.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/mululibanofemokisiza.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/41223339719.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a25884bce28de37ae3d9bd35769b0c45/30951563877.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/norofefasozumov.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/savawowigol.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd704bf277---dimijivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=convert+pdf+to+odt+file+onlinePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 10260 bytes
SHA-256: 1379443bb0e1679b60eb3df085990ce1e7ad4efbd5204d273e0674687afe96fe