Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3795c3ad6d4cbd0…

MALICIOUS

PDF

86.3 KB Created: 2021-08-11 18:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 12618b3193cd088c7579a4fb27a17dc0 SHA-1: 448df0d710c1eff087ffd0daecc43c65e21455ef SHA-256: c3795c3ad6d4cbd0fcb7b71b439d99dbfd6557af449c3f398195f39734ba29af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=que+es+la+investigacion+cualitativa+segun+autores PDF link annotation
    • http://hoanggiaphatland.com/uploads/image/files/tidexazopadapajafobum.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/22979106012.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/niv6fst59nmed5ln75sn43jp10/91450587264.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/0718ild4kokkfud6kfm6122jq2/3108151451.pdfIn PDF document text
    • https://medtek.vn/storage/file/kijopemawugaraxitidutiwe.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/totalitibolu.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/segilobedurazulobegu.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/wejusupulemapenufi.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/zekepajojirixuzot.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/romefokekiku.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/ab0ea8d464f8813d625c960f7da1e85b/fazinigufol.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/xepobe.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/1041097144.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759be09ef79---77765150388.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d32e6aba5---61617585636.pdfIn PDF document text
    • https://promise-land.com/upload/file/65436192111.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/37478214022.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab7dee3db---72013771299.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/vutomo.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/kepuwotagus.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967ce9026ce---nolifosesej.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/7a75033de2b4b10fe9c15a64ce6d4ada/gesomuxi.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/63394771070.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/jikadalu.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/wudotiga.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pts24630tdu6ca3n4gg1op68d5/86935591870.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_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 17464 bytes
SHA-256: 6c7f73515ea8785706288a345bec4019e24b5464fe450c19056bfa10028ec89e
font_02_sfnt_off00013141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13141 10632 bytes
SHA-256: 2f25ef985fcd43bb0beb9418a609e0d64dd6bb09e15a32ecbe0eb34cf7b959a1

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