Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f57bb70a379d31…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 08:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1506b241c5b7510bd38263618e9c6f95 SHA-1: c4481796af04286780fbaa50fd2057c0d3b43896 SHA-256: b0f57bb70a379d31fc9ba70420daf5d34828828dc3a05bd1dd01f790b2f2593f
156 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 disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://195exim.com/datas/files/mepopibilox.pdf In PDF document text
    • http://photopuzzle.net/userData/board/file/togapuminitese.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/pasomojifewekogalekume.pdfIn PDF document text
    • http://aa-nusd.jp/migubarejufelezigepiwisi.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/nugikejaziwebox.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/79899549978.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ed0a6f54b---78765684760.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/36525442995.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/sejudevigon.pdfIn PDF document text
    • http://bamor.org/userfiles/file/ziredasolita.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/6637069555.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/16065260327.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109120647489290.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/rujufevemiretemapamafiz.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7b3f8cc58---lewovozajad.pdfIn PDF document text
    • https://lesura.net/userfiles/file/44590529677.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/fujisuruvujivoxogigez.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/46448274611.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/fijajekugodoniradekenofin.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210907_10_14_22.pdfIn PDF document text
    • http://kelvista.lt/images/files/37379252819.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/gewozulomiwodukafo.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/8384596049.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5b8b900f62fdb7bc0c9e8752192ad53d/32883918893.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/9036873966.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/dilakor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pspad+mobile+ps4+dualshock+gamepadPDF 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_off0000db35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 11068 bytes
SHA-256: 07fd04fd8c7d460f80acf0a52336c13e09289817a732beda09e5ee931ca66db9
font_01_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 16952 bytes
SHA-256: e2eb30a82c45e511ace6beb2e63b09c334b6c94d6bbfb15ca20c1ca408c7a787
font_02_sfnt_off00012075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1