Malicious PDF — malware analysis report

Static analysis result for SHA-256 941dd4e146cbcdc1…

MALICIOUS

PDF

72.4 KB Created: 2021-09-28 01:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a1a55ddc977ba9172dec6452e02a201 SHA-1: a600886fdc94a54eceedb8c4ad39a1269d25eb62 SHA-256: 941dd4e146cbcdc161bbc673606bb8d81ecea7964ff1d3f3853008d59f5cfb7e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=import+bookmarks+from+old+computer PDF link annotation
    • http://fatamorgana.fr/uploads/assets/file/gusakutowijuputo.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/96047022103.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/vexivivapiguzunopaz.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/96845123500.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/15203226534.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/fepavusosakok.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/32075809173.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/33268389850.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/64217699192.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/42123198379.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b0575914460c9e5764c6ae9d9d37757d/nimilitagavetotijekotuju.pdfIn PDF document text
    • http://carszana.com/image/upload/File/romesopopa.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/36706018060.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/45518984241.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/840732660.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/rawareligusodozewifesiji.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/75d3263822961587e3a9b318c263232c/pojikukiwekerawilabuve.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bea9a28de999de1fc5e20856799b6018/puwetuf.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/fukureporas.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/xemibomapabu.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/88629193451.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/botuzexusuxidoxatuwejod.pdfIn PDF document text
    • https://armenia4d.com/contents/files/87599863860.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/gorutuzilegimigubovok.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_off0000b4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F7 10868 bytes
SHA-256: 2c9905b3113894899aa8fb693b34ee1cac83b9e3dcfbbd7644d6887f6d36b692
font_01_sfnt_off0000cded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 18148 bytes
SHA-256: d55277190e998fbe57d0e91fa1ce78bdeab96912315aa9c99ed1fc3a21aba884

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