Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c04f924bb74fd53…

MALICIOUS

PDF

98.6 KB Created: 2021-09-02 14:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c73286690832baa98cb403242849264 SHA-1: 38cc184d146495fe20906e23eb33226044b33b50 SHA-256: 3c04f924bb74fd53493c694d03bded95702b0943d99e5ceaf2e5e3f14e83c18d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content or phishing sites. The presence of multiple external URIs and link farm heuristics strongly indicates an attempt to manipulate search engine results or distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a72157562e0---javewejilegol.pdf In PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ppi8djhvvn21o05j76h8pjusnh/24287274758.pdfIn PDF document text
    • https://unosms.us/userfiles/file/vunapuzona.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160901d701237c---32062052320.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/16672624871.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/fovovuruvazez.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/36722485812.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e7e71192d---24767811498.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/k8dp8frj9hqv4gj2oe7e5e0s76/tedonanufuletanesanekav.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/37394583008.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608566c787731---fazevijetugetezuritepoxok.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/25097300643.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72cdb55904---85912513414.pdfIn PDF document text
    • http://ahchala.com/img/file/44754014840.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607049447ced0---74862281920.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/31657232027.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/9d5626555629c728cc96b325f1bcba34/suxefafajutevobixusivuze.pdfIn PDF document text
    • http://partnercable.hu/files/59551437912.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/59031197257.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/mopixinesimovinono.pdfIn PDF document text
    • https://photojet.net/userfiles/file/20927543615.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161223d1cecb78---35751700860.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/91d047cb3996fd369a319e1d3a9b0414/depipalitumedolofalotu.pdfIn PDF document text
    • http://rc-modeller.se/images/file///zerudus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=jaher+vahivat+best+book+pdfPDF 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_off00011afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFD 10732 bytes
SHA-256: a24e973713bffb783406bc3d0eb946c13eab57193cfc25d4e8d6ced21b8b1307
font_01_sfnt_off00013397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13397 19352 bytes
SHA-256: 278a6e70fe106f6120dc1da95f76a293d4783d020b5b95f4f3e49775e14ccafd
font_02_sfnt_off000164c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1