Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfab36736aa1cca…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 19:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9f724535802581d11387a6c7940622f SHA-1: c3a7d029d7b05c850c90cd1455e4e2dab532fd67 SHA-256: ecfab36736aa1ccaf82435f168474ac2dbc2bc0c637418f3a8b04cf6ecaf93d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms, suggesting an intent to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=bear+approach+bow+manual PDF link annotation
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/95054245369.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/sagitukusewef.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50e93c3b9c---69502839449.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/17739884461.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec2ea87233---47523156606.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/2844275089.pdfIn PDF document text
    • https://serka.com/serka/upload/files/94414421300.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/pokametivepofisunug.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b628d5af7e5---vizuga.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/3c3cecd17df6ffad01aa32b8e79a1ec1/79347403507.pdfIn PDF document text
    • http://citra.cl/userfiles/file/18937281919.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/begufixukevegef.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/xebikudovigizivomudefe.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/823aeb3fbadeac57cef5f598d4c71676/70371945865.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/nitemafofevajadejes.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/1584018443.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/2f6b26ad4966ed59389104ddfc6c1cb7/xizaleku.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/nekuguponebi.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/74255432835.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090412d56e16---57737796691.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/wativodaselidi.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/62345973356.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/jisoborojabagav.pdfIn PDF document text
    • https://keongracun.org/contents//files/96989605456.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/xefovuxoruxikiposot.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_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 10660 bytes
SHA-256: fa2cee9e29bd27268c6fa548cb1c74ee2d17dfc540af6ecefa9902a62e8b7ec9
font_01_sfnt_off0000eef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001070a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 18748 bytes
SHA-256: cfe4e822fe5737eaca401d4bcc03a550a5ee08a94d895ba119f34ad876aaf3bc

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