Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe15f7914f7300b9…

MALICIOUS

PDF

74.5 KB Created: 2021-09-07 08:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d2badb39bff38aaa99799b7fc79999a0 SHA-1: 0ebe888dd5e7413e0f7034afa515003a6452523f SHA-256: fe15f7914f7300b9004d9af24507920fe25cdeba48b4cc971df27fc50d4e01e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=aiou+1424+solved+assignment+autumn+2017+pdf PDF link annotation
    • http://at2apigroup3.com/contents//files/94594124797.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/2dd0ad477edd76f611d2d5419df2cb03/ziraxijo.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726d74e956c---90134442063.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/297b9fb8633811e9b09ec2ddc6e08202/91532639218.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cd1c41e4a---gakinafotege.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/kupefonilamova.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/50153823155.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051312250452.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/42150064225.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/sixiri.pdfIn PDF document text
    • http://poorclarescork.ie/images/jijajetuso.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a84cca1f7---vaxazimejorukupo.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/7el5reir02538t2pgsc4skfs6b/60744463645.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/wajatekekelumopa.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210902064633.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b615bc6a59---vobugal.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/5285432024.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f45a9e396---17023152419.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/aa690pbbhths7mf4caie522i53/dunimez.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/34445912360.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/roromoxatagevavutabuve.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/kewumiruxuvalubojujebifim.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/40948348764.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_off0000bf2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2A 11308 bytes
SHA-256: fd42853d5aad0c7505bdd1e4523b6be665a2124503f7a29f8210eb97145924b9
font_01_sfnt_off0000d9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 16756 bytes
SHA-256: 940904e6c6188edfc5d518dfa5ea6b27fdcf18d3547b7e0fe1de93ec0780cb91

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