Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b131374ba6eaaf0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 23:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8fddfc73c1f522798536a73ea6a4486f SHA-1: dadca370aa06bb59670cd672a9fb073a3c35f161 SHA-256: 6b131374ba6eaaf08d4544a4451dd83ba208fb4758668af6f44ad80b57b0e62d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The file contains numerous links to compromised websites and WordPress upload storage, suggesting it's part of a phishing or malware distribution scheme. The presence of a 'download button' lure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=dbz+tap+battle+download PDF link annotation
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/pskbpnqk19vb8b4kbat18mje13/kowujewubawunifomepiv.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/pevuxetamazogokobaru.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/dajoli.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1925de1d---14211825080.pdfIn PDF document text
    • https://durimawar.com/contents/files/vapakob.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2741568c1---titoduziwulimakiza.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/e2e2e1c7f69ac7c26d88b682ca46a69f/titosifufap.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/90683644275.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/darano.pdfIn PDF document text
    • http://rhondachem.com/d/files/pejadagesibaju.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/3155023381.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/k4la3b2589t85hep9m5gq9jgn2/duzoviwo.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/20194714949.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/porewaxolelu.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/leteriretuwi.pdfIn PDF document text
    • http://quetthe.com/upload/files/rupavirelobud.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/vuruwesadozos.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/zixopomonegalinomalopolok.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/46897290785.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/82100715371.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109060431475658.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/3648232426.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109061413557216.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/fasukaterinadopopunarepex.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/89214598011.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_off0000d4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D6 10312 bytes
SHA-256: dd7408d662fee332a9c8058489770f19cb9e81ffc86bb58264d2602a838ea7a1
font_01_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 18444 bytes
SHA-256: dc42eddb195588ee059c7d84ee36b85de8c1d42ebcf3735c3af850f4d9737ad7

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