Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0682e0e6e80717…

MALICIOUS

PDF

134.6 KB Created: 2021-09-06 09:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 64ee53a235d40420206af8a4c0584266 SHA-1: 5c3173cf17cfaebbe5db2db429348560d2882d93 SHA-256: fe0682e0e6e8071786d7ff8f2e0b3d85cc4f7f0ee340eeb4fbdf42ffc26e2d4f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and compromised CMS upload links reinforces the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 http://ch-bovi.com/upload/files/56941008838.pdf In PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1e2a47ac8900f85cacc44a44c11bb06f/79301818876.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/5033919454.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/wamaduk.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/84818641855.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/6f535e29032c7811be0a38c0c9280182/lavadawilupo.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/wudapejinasiluvig.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcbd9b6e34---49575878304.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/tinaterazux.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612b85ed8a550---zavurerezodabafavibezo.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/tevubugelugakebaba.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/6b5eb82f8389a27ca79d2e92711cc21e/zijuxub.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/budo412i7vrr4kldfndbrtbema/23276298752.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c579ef76828f163da15949356a5870b5/fesikekebob.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d8d08d9bd1f794267c860adbb9af6f06/63036958083.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/93738440569.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078437e66160---13445115167.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/86497883920.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/9730792440.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/edfa729600ce30ae2a46fd2ae4e6ff70/83442491940.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/66715399360.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16091617ed3626---98197324357.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135980f99931---71180051902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sacred+gregorian+chant+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_off0001a858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A858 10760 bytes
SHA-256: c1774aab35630ac6b724e7f3250dd6807364d8a424f4a9c81a44b0d4c5b3674a
font_01_sfnt_off0001c0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0C7 19676 bytes
SHA-256: bfc635a13217963a2534bac315e0d8d3fc59aa5cfaf42d329af39c83f957a4d6
font_02_sfnt_off0001f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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