Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb64f4b2b9f15be6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 00:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f8a43598c481d452774d3fbbd591604 SHA-1: 08ac3552b914d590114006a58520e26b66b9e914 SHA-256: bb64f4b2b9f15be6fdb3fca1d0d1ee0685752741c87e94dc1a3eb8020f09e6f1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting, likely to distribute further malware or engage in phishing. The embedded URLs and the structure suggest an attempt to exploit SEO vulnerabilities or trick users into downloading malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/053417f503660e2644fd5679f17a36a6/71628831438.pdf In PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef1ffce5d7---3578816065.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/bdcedd17e790011e0958623f51a7f7f7/pominu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/6cd1563c5f46c4e5cece875ce439d261/91407200267.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210619014803.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/ronelobadurukevus.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/kobudu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e73d339d92---32091862808.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/95575954815.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/851963e92901f2f6ca892ee7588f2522/xazufugobemuvuxivofan.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/kawozasibubotarafugapor.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/benapofivesaji.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/falikoxapotilamudomopud.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106451754d29---luwumokiritabasozavos.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5f7b646c3---gabiwosifenibemolokupediv.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/47479105623.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd70908347---61336852603.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/81633253104.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b3d3c08cb---wugorufegukigali.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/dojidizufoxivutipefelawu.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-15/images/files/28297045859.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/13066383019.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/47347088166.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/fubepoviraluv.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/17426e7894deceda6691efa9410c4266/53666496532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=tantrika+kannada+2+notes+pdfPDF 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_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 20912 bytes
SHA-256: d6c222cd2db207af4128f0ddb18ea4f514c946249b17c338820de16c964679e2
font_01_sfnt_off00010d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D86 10620 bytes
SHA-256: 66f1a4f146bfdf55a2539cdac2c8ee798006650c4c361e71d4e8ff4c98582df0
font_02_sfnt_off00012605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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