Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fe7bf3235d61dd…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 09:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 208f4617d9edea4db3ae6f64861862b9 SHA-1: 8f442130f03e646256f7b705f55498bdbd399705 SHA-256: 54fe7bf3235d61dd63f8cdbe4703ed47c20b4dc49364f9af167127d73c2b814c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous URLs pointing to compromised websites, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggest the document is part of a link farm designed to attract users via search engines and host malicious files on compromised infrastructure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chcial.ru/uplcv?utm_term=free+download+sherlock+holmes+books+pdf+in+bengali PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ebg48e5bpn78g6s7kvhfgt6ib2/82998547932.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b43e250cf287ff93b87d1e4d22e0ae81/kepaje.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/43805033330.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ktcr3lh6fvomquh7hoq7hgk957/74098719844.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec80a8d051---95313758953.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/gewefokokunamegofusim.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3358ad68d---kakokiwotabilobu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/92666067f5be1f1611598149e69ad63c/94951911537.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/o0tvgjouqes2fkb9lha4m74nl7/xomozosod.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af91ba684d8---87886272471.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/61635922768.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2840672de2---3011387120.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/numudidalediwipekaledavet.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/40803837198.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/momisuloxizu.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/17/file/76383918734.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/43a1f6e6d8dbf64b4526f30ab84e5561/kusaxirol.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b2c5f0ff3---zitedezinovodalal.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fef7be1afbd---33658742951.pdfIn PDF document text
    • https://efnnma.org/files/file/56585998943.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/15337228287.pdfIn PDF document text
    • http://computerdoki.hu/user/file/kafegakefuvewaredemid.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/61709288889.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/pepawafuwejegovit.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160790ca6d0c1c---49406423555.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_off0000d383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 17660 bytes
SHA-256: d1f18a802e95097b7ebb96fe467b686837d613c520e4a96271321d430e49e99c
font_02_sfnt_off00011930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11930 11264 bytes
SHA-256: aa9e4c8a7430be78f006ec0467ce9be4996c575593ec302b739d7bf3ba97c921

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