Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed914b10df73d4d9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 18:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd85e0ce6d2d7fe51db8b3f1566bc171 SHA-1: fdb2b8be45200f36f6dcde73dd93dac2e7293ef1 SHA-256: ed914b10df73d4d99dda3e894458b987ef8d9dbbf170c110c2acd3a3880d80e6
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=wooldridge+econometric+analysis+of+cross+section+and+panel+data+pdf PDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612195fd0e934---72241214867.pdfIn PDF document text
    • https://blokhol.com/upload/files/jozodekarixi.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/97766534763.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/68787967216.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4ce7f262e---35328265583.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/82652482415.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fccbbe8947---sitok.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78d14de0e4---runejajodagepaj.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/2608003817.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/43478228432.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9b253a1dbfac7a119d053ceaee8037a3/lofetemapenil.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/45638603228.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/nitekudem.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/6f0eb5ccea37ec6e73bffa855724c361/tutefere.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4d47a2cf7---61251217362.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/drm07gq44k44hfjbmekqshnc3a/pedijob.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/59104702551.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/sexusejojipigisukixuweral.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/56303736374.pdfIn PDF document text
    • http://schokozentrale.de/idata/62661269864.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/lagopovagelizez.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/16263606998.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd6782772e---dazojawotonezexiramapi.pdfIn PDF document text
    • 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_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 17660 bytes
SHA-256: bcd13687d3e23cea10529a0ce7de7af4f5edf19fc584ca3b4dbd1bc589813c61
font_01_sfnt_off000106f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F2 11068 bytes
SHA-256: 332b988d81663ea57f7b823a53e3cb4ef73effa4725ebeff537bf9f89d09c8f8
font_02_sfnt_off0001208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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