Malicious PDF — malware analysis report

Static analysis result for SHA-256 6707f1560582667f…

MALICIOUS

PDF

99.8 KB Created: 2021-06-28 06:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a42c350efd145b5bed76e37b923b4ad4 SHA-1: d531922030a09f155d5e7fa245167cc1c5ef4b72 SHA-256: 6707f1560582667fa2d0482a20119158aa86817cf5904bee65120b698045fd5f
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download' button heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • 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.
  • 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://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a779aa812cc---48515103163.pdf In PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/da7f5d478215eabb70516b7dbc23d4f6/babijozaveju.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721a2ca45a7---99221599228.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18f9d0c4c---10853343673.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/uob8a65i3f2t16ijeakcjurgo8/wabuxaloduv.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/doravaziwusajuvutag.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/kesewuvurodasajowom.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/sediviwodasalesetulegima.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ead456a7---15383469184.pdfIn PDF document text
    • http://jucal.es/images/file/jeziv.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608277a5bca14---6594833874.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed7d3663a1---32231162842.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f3e190f5b8a74786853ba2c09ad35183/sovubakuguv.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/fibuzimifiripelidibuli.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f1164e70453b9516677bdaa719a9f1f6/64204115179.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e9db61c3---vilaravovezepuvidanoz.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/selakijifutavemofogud.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0eb265a23665a8c5f468c33cd5432728/seloretirolulubawuxuwu.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/bcb06e0d346f343065b7e0fbf235558e/65860841426.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607875a7306e4---41972327427.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/65183718104.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///lerata.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717941552e8---98258942550.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e596003c9d---gemaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=clash+of+clans+hack+unlimited+allPDF 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_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off0001235f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235F 10864 bytes
SHA-256: 410e68e956d5d066870929120a8656543e2cce9b25c93f88eddfc037b4c0839b
font_02_sfnt_off00013c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4B 16752 bytes
SHA-256: 87b32a99b0449a299769d1fe2f96835bc2e08cff972b3223bdd7a7924b92e160
font_03_sfnt_off000167b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1