Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32212271042e025…

MALICIOUS

PDF

98.7 KB Created: 2021-09-02 20:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6fbd54fa8ae74b15a1724334e493967 SHA-1: 39816a9e16330ae67a21cfaf61146d50b5785ebd SHA-256: a32212271042e0253349cbc7313cc65959efc1124991e11c44a661010d0a0ad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm strategy, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted from this sample, but the PDF structure itself is used to host these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=braun+series+9+manual+english PDF link annotation
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/pecdughspm7hfpevb7occ8v372/70250886758.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160843527ba761---metileloxutezoxojefe.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/pezikejulojumujoxaw.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/916f8e452b971d18e1007482289d47f2/manigepozowemotizo.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c3e301116---tuketunisapuvilatotusuje.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/61742051993.pdfIn PDF document text
    • http://premium-h.info/files/files/67888832271.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/o1kdac061rvte1m361bfs984vb/xerakukowefanubalit.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/kuzuzudamalabopowav.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48856d963d---36458116159.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/xevanuwakinimuzibago.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f5311001c---54138612318.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/56q1jrcns3hd9guq01bl6hah0o/73734311799.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/6ph2730a7lfmgdtdsgm3dlb436/jogumil.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/92t5hc0v2c3lk8fjjnqkldjenu/25915651408.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c69f3a91f74---misegisili.pdfIn PDF document text
    • https://luminex.pl/upload/file/23360552925.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/27643569874.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/ritasotowinixemadifez.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/71466037710.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076761a90396---83535659309.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/23897787284.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_off00011dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E1 10656 bytes
SHA-256: 6163cec44fbcfdd66e8b77bea4fd53ddea0b0e2db2e5d2c3602b2a7d1392712f
font_02_sfnt_off00014e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0A 17948 bytes
SHA-256: cde5ddf3119ec27eaaf1e5abf33bf50bb399afbb7eb64044bc02bfca470f7036

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