Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f5d3f4b2563190…

MALICIOUS

PDF

93.8 KB Created: 2021-08-05 08:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 84b38fe1aff9789f78646ee3631a71ae SHA-1: f50bbaed4bc9925b88d1fed28a1a6b3305fce392 SHA-256: 92f5d3f4b25631905b053d6f5fb139ba0d3c7ab7440c190deb3205f6ad711428
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=samsung+galaxy+tablet+4+charger PDF link annotation
    • https://linker.tw/files/gilazomuvulo.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04da48686e---jalakodazufigerof.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6fe3de129fee39233483a0d901a00f31/96213762038.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/fovatekufejo.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/volujegaxoperufawuk.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4cb0fdf10ad9272fdea1486f7d16ef43/43715271170.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/033f1a12888b2edfb485c17ca5f7d557/82407538141.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/25712218948.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/05f0cb22272f310eddd0ebf5cfdf86cc/16119573444.pdfIn PDF document text
    • http://richfield1960.com/clients/865265/File/89927650216.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/jobolozedobazudupubodade.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efe724355f8---rijagugez.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a83cf8a668e---biwivirogixilegajun.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bba791af9b2---84440795030.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5766422bd3---govabefokomox.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fe6cc2ce6---tazitulorilozewisajus.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/48abugldnil20lfhoilh5poufv/33293809135.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/59009443718.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/wubadek.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/pciffr6hkosqcv22onomfbk355/nujilusefavexez.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/gaveduwizutejutazudurumig.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/tivesuvujewipok.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001092c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 17576 bytes
SHA-256: 99df7849a8605a0a2ada617b7f60bba42a92459b33965f4c2334eb5b945cf059
font_01_sfnt_off00013759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13759 11072 bytes
SHA-256: 1735826833ef4db7fbe6f90d92ff5b395a2ddc7dacc58b549f0540b5d2f7fb23
font_02_sfnt_off00015116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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