Malicious PDF — malware analysis report

Static analysis result for SHA-256 b504545a9ebcb8cc…

MALICIOUS

PDF

81.3 KB Created: 2021-07-20 21:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc7162943c2b30f5b1d95d3cb6c4e089 SHA-1: 829e3da43bb47c78665b7706fb170482da5b218a SHA-256: b504545a9ebcb8cc348688e663f490058b37bcab7aaea97d415da901b718b908
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/97d955be97098b7f5f213d711289a4bf/kakivovisupu.pdf In PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/9279747626.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09f67ba91---ziwavi.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/18322287829.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/512b557a5cc96b6e94614e11fa5815a0/kazononiramefidexoziz.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16200883524943.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5453126a---vusidiganigajunarekonor.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/eahs639j3fpd8m92sspp7q4ne1/gapufojuzefubinobalawexut.pdfIn PDF document text
    • http://crediramasrl.it/public/file/29133242338.pdfIn PDF document text
    • https://bestwaynepaltrek.com/ckfinder/userfiles/files/53481790575.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/32827737248.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/balolipesalobu.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/22479632211.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8d411840b---kajajuxubapaboruwiza.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/1c466edb9ff375b56d52eea0196334c0/fowulurodunosexunuzaz.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/20001372355.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/99049334442.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed3b20fff6---86319378756.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809362430af---7148742013.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/71f25cb633723bdd8022e927ec367918/85232964455.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd17a37bcab---79520405451.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160858f2d21bd7---dekowud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+hunter+call+of+the+wild+save+game+editorPDF link annotation
    • 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_off0000d969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 11136 bytes
SHA-256: a5e02c85990525dd782d524ecd062328673150a92a405fbd1b488a290dd9789b
font_01_sfnt_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 16920 bytes
SHA-256: 7dfe8294f0659af52d7850cfbb8302f0fba64d545b2f4e02d1a00d4f30c989b7
font_02_sfnt_off00011f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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