Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6813f097b654f5a…

MALICIOUS

PDF

89.9 KB Created: 2021-08-17 01:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9203639e19b13f6d017a7fc709bb4b9f SHA-1: 97f444d30f431cf58835274719a5167afa99ccef SHA-256: a6813f097b654f5ab56565f83f36a5f1d72a1bf9d29d049d3b1ad37a4fd33a60
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised websites, including those using WordPress upload storage, suggesting a phishing or malware distribution scheme. The PDF itself is likely a lure, with the embedded URLs serving as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://geo-equipe.it/userfiles/files/74925784560.pdf In PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/25513084205.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/litonaguj.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3455525363---53662377749.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/36384036228.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a764c119ec5---47105213921.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/texemoraxemavavanapefif.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609478bb1fd03---nitofagor.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210604_4FEEC737CEFA6A25.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/69423765741.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c27e54e0359664390de764ad56b281b9/sonidavojoginen.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/rezozozixef.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/losibifijedevodexig.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/takejevodor.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c169fe6811a---sogalep.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/77240823728.pdfIn PDF document text
    • http://soul-program.com/clients/e/e8/e84723a0d254fbc5507aaa4bd1967541/File/77353288174.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/a7mdgk05j2gsuj8endlga6dpjd/88135776091.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/da93de4a99d5404f0f4d1d131126cdfc/61081503340.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609875b154bee---kasemodozefudanirepowo.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/jomejeginiredaxa.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/fitezuvemovejakom.pdfIn PDF document text
    • http://whatdwellswithin.com/file/96784652395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=convertir+de+pdf+a+dwg+gratis+onlinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 10856 bytes
SHA-256: b1aa98b922bc0e68618b7dca3bfc7a9c78742284e8e4523c6f2b920c9fde2013
font_02_sfnt_off00010ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBC 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_03_sfnt_off00012437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12437 20292 bytes
SHA-256: e3537cdd2914b04768c16b304c8bcdef8cdc4fc20cbcedd6cce5eab2db74a152

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