Malicious PDF — malware analysis report

Static analysis result for SHA-256 534501af063906bf…

MALICIOUS

PDF

72.9 KB Created: 2021-09-19 05:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9733a7ba7709900ebceea15d46cc52f7 SHA-1: c799caa09ac7f0563c53e195ebde1b1cc6c0f9e3 SHA-256: 534501af063906bf86319349085bd02f4d1441d0b818c2f7455efdf30a2db676
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=tekken+3+download+app PDF link annotation
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/76389366612.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa74a218e---folel.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10471898915.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/1868113665.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/muvezoru.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16135f7f040aa0---nakebijara.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/gejilaxarizizu.pdfIn PDF document text
    • http://canvangdientu.com/images/file/disudiponewilimede.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/nulobaruwomisujad.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/temekoboj.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/tipuwewidiza.pdfIn PDF document text
    • https://epiphanych.com/images/file/bepapaluredegadudis.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/farekevupaju.pdfIn PDF document text
    • https://artbynela.com/uploads/file/40132077743.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/luvakemez.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/badijulanulovamafiwiruxe.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-8/20210908085455902985.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/dokovomixuxerifago.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/buveruz.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091119551882.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/fadurimon.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/70860854566.pdfIn PDF document text
    • https://allianztc.ro/files/file/tomakegiw.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143af31a663c---82977561184.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_off0000bca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA6 16472 bytes
SHA-256: e684c3856739d2514f2246b96a97d9419267213293032465c8572c4a34c366b2
font_01_sfnt_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 10240 bytes
SHA-256: 690721df72eb8b84926567901ceed27a9e4b2bd78fb043c6c393c0fe76516238
font_02_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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