Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d4eb04b206a5833…

MALICIOUS

PDF

85.2 KB Created: 2021-08-27 04:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d913422a53253d39d588eca3136595e1 SHA-1: 8be86b13334f43ede85d9503c4be119cd26e583c SHA-256: 3d4eb04b206a58332bc217b510c909dd3b8d1e5b82ca74cda401b56e6f93e13c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to potentially compromised websites and disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inventory-acepipe.com/images/uploads/files/lowifusaburosez.pdf In PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2e8246b9---wusobutelusadetifizati.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/619b4f23171c844b94ab224cd159eb21/71131613539.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/5890451136.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/pepubekuxuzavokamenobe.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/l1nfo2ni733d1fr7n9befefu0a/95671543929.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/44971452316.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/74459591410.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/22771326021.pdfIn PDF document text
    • http://rfamilylucas.com/clients/73238/File/30190461094.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/24484845581.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69d2f2d972---65363889289.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607e413d5efe1---widijaxagizerexok.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/sonuzuvijixetutunolokato.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5769811429b53fb8d81ff31b7b1204d6/pajojedagijoragox.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086275364062---pubilivetamogusupizagejit.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47af2eac24---68060986437.pdfIn PDF document text
    • https://krossi.ru/images/content/files/52579356902.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/xobuzuvozedirer.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/71408723278.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/gobazavonifujibavaxane.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/l0f45aahqv6vm0dr3qc5sm8803/16877538339.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608713f9ac23e---naruvanemivo.pdfIn PDF document text
    • http://gestmase.com/media/images/file/fupelotumilusezivovida.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/58748579222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sample+warning+letter+to+employee+for+insubordinationPDF 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_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 11356 bytes
SHA-256: 4f30be235eb5298568b59e997fbbd81676c10a7fb9bcbcc25897b0545026baa6
font_01_sfnt_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 15924 bytes
SHA-256: 046e51f439fc88a8b5ea09a36a06caa6c443760b7e549c4028836eb7a0382621
font_02_sfnt_off00012d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1