Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ad50d07c6b6f6c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 12:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6faadeb9a8d54257b04aceff5ae5203e SHA-1: dd7360d1ccde2481450185939586611429dbe5c0 SHA-256: 47ad50d07c6b6f6cf7bbcc97748f8c97142c26e14d4077cadc8f0f1f74507d1a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic findings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf2b89f03---30641489403.pdf In PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609eab89830d3---80839938969.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23d8c81f70---58886691048.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/wafinelalokifezini.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/5580191770.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131af6c6ab02---22486220405.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/pob7linfem4tmbeusc5qkv5fv5/sizaterimolaf.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/1077555996.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/in0h9g1njcimqjul73htij0dtt/xodojatunidu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f03a0f63d---nadij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf9a1b5579---8933779237.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/lurot.pdfIn PDF document text
    • http://51www.org/uploadfile/file/fcd8df0e7b68b471bdf46e3890eeeff7.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/84271580472.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/5f0itj51v66k0223md0g2utac3/tozomiwowaxujinujijilug.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/88265977235.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/sogawinuzoguxiw.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/lokureporiripifotemen.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb81ae715e---33861919478.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5n2oktd4ptpd2t56fb68lfed92/77509334288.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/xigol.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd067bc8d---gubizenaduxosobodokosaw.pdfIn PDF document text
    • http://neteyes.eu/editor_up/xisagamitobabanimopa.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/96270117981.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/p80r7fdkcjggu1kmbmnpg8rh89/75916066219.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/aaff833c70c82a1c06be43be2f8787cb/26246887735.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f41ced587---batagukut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=yi+handheld+gimbal+manualPDF 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_off0000dfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 10432 bytes
SHA-256: 4103efaf0bf6ae42c29d49b4675aacbde7246490cbe5156ee673862ce35805fa
font_02_sfnt_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 18856 bytes
SHA-256: 9af512e116bc97af812fe388c4fc576162a5d4dff71ca64587c18d8fac16d550