Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97011fe26989918…

MALICIOUS

PDF

90.1 KB Created: 2021-07-17 11:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43be15352d14a61f8e1c8872b6aec498 SHA-1: f7b0f7cc23aaab982925af109b35921ad0bd3e03 SHA-256: c97011fe269899187f2157b872e5aebb145825a8e4e1f8ed9384b3f8221a8321
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The primary function appears to be redirecting users to potentially malicious or compromised websites through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cuisinescartier.ca/upload/editor/file/52208298409.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59d568ae8---zivejobap.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607500c3d91a8---paxiwesavisisesegopopoko.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/v533svfs9df7ui13dmoqb60jqg/71312214293.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/fajokakekijenodow.pdf
    • http://crystal-lamp.ru/uploads/files/38048294978.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2b943a1fe24bbd28fd83040f81ed2f52/wuwijokudetopatepu.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ec057e2e17f9647913063d639c7406d1/jimitiseti.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4379b38ffc---jimujupajarijod.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/6bd2539fe583902fd3ac2839c4fca3a2/81685137085.pdf
    • http://mn-print.ru/ckfinder/userfiles/files/vofuzejometixoruzile.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/8f08a6f3adf5b9c422c9e49e7c7fbf10/91673907333.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5f0bfa4059b1d1fa449a05e1bfd5e06a/jewumomusupod.pdf
    • http://giaodantanthaison.com/Images_upload/files/naxezanavepukewofajob.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba657bb6082---75881143466.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/98879565653.pdf
    • http://sevenseahotel.com/uploads/images/files/levew.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/632de746d513f60643dc8ae7b16ebbca/30059015352.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a9d45b12b---48498921667.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0369c4k613abkne6lu0rg37pjk/nododosuze.pdf
    • https://plentis.eu/ckfinder/userfiles/files/45471572168.pdf
    • http://popmetre.com/news/files/sebewemifabogop.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/4b18c4bee713ed3a175f8f00257acc8e/vejobogegowatomikan.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=spirit+of+anger+in+the+bible
    • 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_off0000fedf.bin
963c08f385c1ef2b12c111fcc41233086338d4b6fa8e73be929113cfae76fb20
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 10684 bytes
font_01_sfnt_off0001170d.bin
4e13917d729f39cc879ee77ce8fde3ae81c74353f86465692a987ffbb568fa8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1170D 17060 bytes
font_02_sfnt_off00014350.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14350 16792 bytes