Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ba92099deca68c…

MALICIOUS

PDF

73.8 KB Created: 2021-09-07 09:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f82e8741ab25839d2007e4c5d42aeefc SHA-1: f03cd99c6f63f4c94d81540d5239854739dfee45 SHA-256: 81ba92099deca68c21852c1791d435ae29ffa348b095302b7d4752fcfcb9597e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to potentially compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://queure.ru/uplcv?utm_term=tortilla+machine+manual PDF link annotation
    • http://transporteslaplata.com/imagenes_web/file/36110893727.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/55059966007.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b23269a141f---rutiwav.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/jijijado.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/38569334202.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/80165225168.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608319cecc03a---ralidevisixuvesovo.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098d4ee27b48---refozabapiwafer.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/71909041562.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/aff8b6b4e711ed893b901f3991c5d97f/joponefimugupejivep.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/20036563497.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f966e962f98---51848302560.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/4759992595.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/notukikizoverepekororoba.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/dda852c422640f7e0807578dfddf654e/jubonurubomajizadamikilat.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/20949677753.pdfPDF link annotation
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607bef3e6f851---48429972838.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/merazij.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/28007352522.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/lovogenawukipetik.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/48780318690.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/witona.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_off0000bb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0B 10388 bytes
SHA-256: d0a7605ec95784285c51287ae96260e6adcd605b8d6d6ac987ae9fc8de966628
font_01_sfnt_off0000d253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 18344 bytes
SHA-256: 9c56ae2f3bac3decd7bb6deed1e145e3b50c988abd7a097f7c4c74faa70be387
font_02_sfnt_off00010210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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