Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6ff94c06411f43…

MALICIOUS

PDF

79.8 KB Created: 2021-07-15 20:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9b47344f6eac767ec0eeea9ee80dd166 SHA-1: 59842a491ce214e1af2d98e1c8cd9a8d66dc0a9f SHA-256: 3f6ff94c06411f433616318eedf90576bdfd96899ab24d0fb9daf786dbb96229
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/bk0571cviovmike2h4ni3h58ou/42687659826.pdf In PDF document text
    • https://facades-et-traditions.com/actualites/file/69248449924.pdfIn PDF document text
    • http://allycatering.com/userfiles/pexowexawomud.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/gojukuguletonobuxise.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/46087744000.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609082b3ba56a---divubolag.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/59808621681.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/6079176915.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/20760795263.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a3ea3195d07ea4efec52b508e13bae8d/gobewijozulaziregex.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/77485316969.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba54c511ce6---vuperak.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/rsqb1vk60tbqd06gt5gmes3lb1/21417075679.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/016499fbe77a4b75111c73c4774613e1/17153506372.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/xatukosowumavevi.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/9994df2df104ca01c00bf0c991ca2324/bipuba.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/16aa44ddadb71d6069bc62e5aaf53674/pumezub.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210505192345.pdfIn PDF document text
    • https://btegypt.com/file/poxesogibi.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b3a230e58---30566415861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+hermitage+of+braidPDF 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_off0000d6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 16884 bytes
SHA-256: 220c870c5ebdd5372aab685f3aef85b92f5092faa27fba773a46697aa15db425
font_02_sfnt_off00011aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAC 10584 bytes
SHA-256: 10bcd5a16cd6d6d963987ae8777eca4a75245db2597b97847de44f753d1735fa

Open this report in the interactive analyzer, or submit your own file for analysis.