Malicious PDF — malware analysis report

Static analysis result for SHA-256 9373e320d569ff54…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 01:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9fb8871a1ec7fcf09830a6f383371efe SHA-1: e620e8061a88b98739852624ea710e8388ae3038 SHA-256: 9373e320d569ff5472699942dd2cf98d500ff22dd9510faf84e1aba9cd033176
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://theprofitnesstrainers.com/userfiles/file/71412223903.pdf In PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/gugafemogifupiwelag.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/babemaxixi.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/5625776348.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/1616470951.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390916c4413---birizetajexovojigabegegu.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/dozinadozawojevanitazoto.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/vovobojane.pdfIn PDF document text
    • http://wawa757.com/uploads/files/ridafexadipi.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1i0j3k8j5dlmf0hhrbke0e787u/napujakerinisafovoxibe.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/17096498565.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hbq80l03cqpoc26uhgdegkjf0m/wemipusadujumafovadi.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/9466084006.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161326b158d640---5071503457.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/dapotaxatukewom.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/xapux.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613798d1b0681.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/51176760595.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d046d925b4a7a985586fefcde2671e41/xobekodumivumukijapu.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/keruniragorojeronodeto.pdfIn PDF document text
    • http://forti.in/userfiles/file/10968936489.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0135a83f3---figigunamupige.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/10299631646.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/52561895642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=best+android+gps+navigation+appsPDF 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_off0000b31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31C 17356 bytes
SHA-256: 47ec52a1ed64b8736d9b9247335b11c1da450dc048dfc6928f6487c1f192c1fd
font_01_sfnt_off0000dfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDF 10640 bytes
SHA-256: 9caebecf2cd54f1df849853173a63b442a6aec449cf487e9a1931411c99e26c0
font_02_sfnt_off0000f834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1