Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f590ad9dd6ef7f7…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 10:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bd8fd7a01e0a95bb79da88e2a03ee087 SHA-1: 0d4e306ae99729e772959e887e5dcb1fe52b8900 SHA-256: 6f590ad9dd6ef7f78cc1752fc22e9078a4b614aef448cf2714211a90ff8c3f43
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of these links and the nature of the hosting indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=fotona+lightwalker+manual PDF link annotation
    • http://am-assets.com/aom/magnolia/userfiles/file/sepadexiduwolawezup.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210618_119B08D56DD37CAE.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/maxuxux.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/60312871626.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/4708359442.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210726121123.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/54923812282.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/73657907348.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20217591201155.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/wedifigisopok.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/95988435606.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/950745944c5ec56e821a3fcb7572c627/wobexi.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/36275347185.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/xoserugaj.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/24246608266.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ee9ec072e---ribixuwemetesefuxune.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/67851444519.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kv9vaso369633fnvn54eu1mpi1/24998783101.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/15025308428.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/51947042212.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/92954279151.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c07d1470fdb---vijesuvamafijulu.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/fuxofiwazatil.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a09480928ea---sulomugojefin.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4b87c279d---sojunuzutivezot.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_off0000db55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 18024 bytes
SHA-256: 38fa14e5fc507a85c90dd862b3941a851b29f7248e46e27dc34017abaa119b41
font_01_sfnt_off00010a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 10640 bytes
SHA-256: 020fb139607f9e7b1c9d8ff4fca6c7c7c25804362cef46e876320601725aebe9
font_02_sfnt_off00012234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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