Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2c99eaea170091…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 00:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f69016a1e57bbbe1f3841347fc44bdb3 SHA-1: 9e88b8f992c6eec22260711bd1f6357e58e052bf SHA-256: 9f2c99eaea170091e1406bac008028964d426f4764440a4ecd403590747a01ef
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of links pointing to compromised WordPress sites and disposable domains, suggesting it's designed to lead users to malicious content or phishing pages. The presence of external URIs and link farms indicates a clear intent to redirect users to potentially harmful external resources.

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://medvor.ru/uplcv?utm_term=how+to+embed+a+link+in+an+email+gmail PDF link annotation
    • http://merklink.nl/site/data/ws/files/82981214808.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/f66gj93ep52uvggjjt41ni0dus/71600195563.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/rmh1jn8q73oiffqrtqjiac8k22/nosufaw.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/kefaba.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/19466252648.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/nefijosemoxovubapozovomig.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/rakek.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef79fdc70f---50131361114.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7dca46920aa13aa2c4cf46429d09e435/19760413099.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/44475105835.pdfIn PDF document text
    • http://kezmosas.hu/files/file/36027711348.pdfIn PDF document text
    • http://bacviettech.vn/userfiles/file/17218203389.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609028e74b875---44374940728.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079e0a60a3a8---rozuxejedano.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/82701768516.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/42778400251.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/2eb984f6e3969bf15987aabe1eabab06/fiwexez.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/5274824940.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b1f911a38---supaxetibadop.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/d0d02fdcb2deebf4dc0b045eb644b57e/nugunaponugu.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/36229187140.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c512cf5c7f51f3a84f711a043c3f795e/63627019617.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/kimom.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/83800931865.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/32799681906.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_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 10632 bytes
SHA-256: 7219f331cc85bc5a50dae7f1bd7bc85689a97f2367e01c914e4c310b43b64322
font_01_sfnt_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 17900 bytes
SHA-256: c38deff207abbd240aab4f33e1528b39584aaed78cf282bf17bfc67398ce98b9
font_02_sfnt_off0001239e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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