Malicious PDF — malware analysis report

Static analysis result for SHA-256 74773826db22c2e7…

MALICIOUS

PDF

90.2 KB Created: 2021-07-22 20:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2c90eb27783e5603c186945a28370934 SHA-1: 3da3d00b03c4e3d5416edbf8d7d371f684529ec5 SHA-256: 74773826db22c2e7358d6e0110216a6b19185da7b1ba15fda4aea8ce3edfc37f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many of which point to websites hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://sanders-scottfamily.com/clients/26926/File/dijubebijekoxo.pdf In PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2be37c2561---6828014493.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/potedusuviro.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/bdndits1kb8a510umo4kd164p1/24435122754.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077f0d1700cd---xixumoziwil.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/96602508680d0e7494ba5751d4df478b/66942682047.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e7dfd9d3a6a375a1f9d95d76fc5f435b/9097527321.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfa4ddca7c---33955487647.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/kukalutidejeveweka.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210621035230_233238330.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/fawiriginewupunewu.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f2350cc6---10879196647.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a601ecd4a8b---pufikivosofif.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/75029213761.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/28687522136.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/86782675338.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a98ae70e558---19367877792.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ee2c59f84a37e99404d528b42c6874cb/96097765459.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/tozogeseketanufugoxan.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/10651791935.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e0f1e89c7e7f92e19e2d7f74fb06dd2c/lezuzobu.pdfIn PDF document text
    • http://aplus.to/userfiles/file/duxev.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021063023414273499.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/jifefu.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/75685983465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=god%27s+protection+and+guidancePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 10816 bytes
SHA-256: f04555cadcc918b8a2cf2bc7a0dc468ba967e6a1262dd51e13fb278f92186dd4
font_01_sfnt_off0001167f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167F 16564 bytes
SHA-256: 74125e9a92b0460e5cd3aa765cc3e3a35fbc3bb0e525fc3a2ac6f9a72fd98b67
font_02_sfnt_off00014185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1