Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8edbdc949b5c02b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 16:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e1e8cb5b452d72e8cf8f04141d30d13 SHA-1: 752570ee4e452bed3d73eed9be93fb9c8627f9e0 SHA-256: e8edbdc949b5c02b6df50b6b81b80fa11c2f319796e9769605f0b8db073598f5
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=pdf+editor+app+for+mac PDF link annotation
    • http://dentistturkey.com/image/files/tojedijibebibifaragowonup.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/kg3mj1jji8te1avgbb3mippt80/tavaso.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/bumiwad.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bfe4aeee9---giropivetosakar.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/gikesiwavitagi.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/74907295325.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/72948032917.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/jukikalosotuga.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad5d38387---20824032871.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/67381385659.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/mufev.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/77441627947.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/330459efbf4ead1fd04149aea19d61fb/vewaw.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/29226590782.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d917134c66f---nurid.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/mupobuwesamefixamiz.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a8bd204ef0---tizaxamesoxulopoxolu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a788e98bc1d31a51ff39be37744ccac0/xaporevuzuz.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/34526588748.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/bfc604f75edcde04589e3e12e9648cd3/dalevenedafamerutikerol.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4110eb509---77460456311.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/mixoguwugumurudamupex.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/6ae9nqcvgv57i12uq8c43o4s17/kipuduxijasutep.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/020a3c1269b5aea4d27070d7be1dfb05/59504626689.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_off0000e1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 18772 bytes
SHA-256: a1c347d18cd166e632aa12b22191add95c20bc115f6c874ae4f7b9090f855890
font_02_sfnt_off00012abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABB 10464 bytes
SHA-256: 56c898ef3f195fd828168b914345c79f43886bc7603dd05be14e261efa434619