Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1d467f73e10ba9…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 01:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4454905e689f4d95c495d26bf48d151 SHA-1: bc1016388e61ca03921c40cea63f28cf1c673eff SHA-256: aa1d467f73e10ba9f06df04f5e830f407ebd9ad652a00593bbd875ee6e74c335
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS upload storage, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=angry+birds+friends+old+version PDF link annotation
    • https://costarica4d.com/contents/files/77743091475.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/uh5e18ov4an2p4b6vre314rrhh/netuwasoloremimaron.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/juseravorebaludujetoso.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/35331438479.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d520142709---33403132043.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/45709355736.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/retewomefeso.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/dobunafemogisiretepufot.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/tuwidumevak.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/65307378633.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/luvisafuso.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/44527089129.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/tqqfk5tdlt0vjg7mafmhuikhh4/94702608532.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/91250169884.pdfIn PDF document text
    • https://stotex.rs/files/jujaz.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/p1g5ud4nimrnbp4rv7trh6umc6/fuvilajukexobigorezaze.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/xapinumoropujoba.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/88666708063.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b76ef391e---jamerutezu.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/15816422778.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427f0624ef5---65294746229.pdfIn PDF document text
    • http://soupworld.de/upload/file/28239844923.pdfIn PDF document text
    • http://atoutslegion.com/userfiles/file/rifafevosibudinesiran.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/ligamupaworepodobutix.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_off0000d430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD430 17376 bytes
SHA-256: 6b226891b6968099fe9716f3c0c9b7aff89db80dce998cfd547b7c9af193d87b
font_01_sfnt_off000100ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AE 10572 bytes
SHA-256: ecc4a2decde1ea1e8e7a19532928a17470d3c4370e648d1a7259d87500e8273d
font_02_sfnt_off000118b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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