Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe583dcdf8c96a6…

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 04:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 32a7aafdf5878ccda892866b03299422 SHA-1: 205d6eb071aa30159387ea533c402d870fd1d5fa SHA-256: 7fe583dcdf8c96a6507cee0abbeee586d7ea2576ab07bd0a68d4ae0e51673b2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used to distribute malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the structure suggests it's designed to redirect users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a159f125b---komuwuzetuzuwege.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92e1b6b42---gitalomolenoru.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a61f4807ee---76039899362.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///dipimoxulujufamidinaje.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/6058167e136dc364d38517dbe4a1fc6b/putabadidegusewotobamop.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/turovifaxegowafedawofewiz.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/gamurifiw.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9f036a456---85772170185.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/taxegipoz.pdfIn PDF document text
    • http://uhli-janmaria.cz/userfiles/file/15294447610.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/287435119610134bf200ff.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c28b6164423---51690420711.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/3e7013bc61757a4707a6a46bc387ce94/gimevawezer.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/kurozabikul.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079f0377f7a9---77018153769.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860ec066b1c---kemadelutago.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/12276762834.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160db49de75fc7---9768180838.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/petofirin.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/11508696486.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/dajogiput.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/zifaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bsc+1st+sem+books+pdf+downloadPDF 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_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 11012 bytes
SHA-256: 0be38d2fb0c931da7de5d0d6164d686e1123f4f1699a28f3cf2fbdf794e50454
font_01_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 21104 bytes
SHA-256: 304b2a9273b0c5c793054a56ee83d4d25eb7c4ae19f836dfd1955fee66c0080b
font_02_sfnt_off00012fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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