Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1098a9ab03734e…

MALICIOUS

PDF

93.2 KB Created: 2021-09-05 05:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 32cdcc894acc3b8c93afb0920c0ab448 SHA-1: 9b36ccce2b9e58b0602e27555f77a1a4e2d2ad4a SHA-256: eb1098a9ab03734e69aef9a439c32a6695136596e63cbfb6005326719f63b3c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns align with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085950aebb0a---lubegozoropipevedo.pdf In PDF document text
    • http://njchemland.com/upload/files/60494383899.pdfIn PDF document text
    • http://tano-cable.com/d/files/gavebaxowoxojixomuso.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/55944320959.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/61366882930.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/47632934276.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/wexelewisunenix.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/91433932655.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/34919348671.pdfIn PDF document text
    • http://hak-al.com/resimler/files/talibojujajavewalulon.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bb4630777---bokavipixotavufal.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798d84be923---tudujago.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/48070461503.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/tinerafefakokosil.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f57fd1bb335df91f491baf9d6c5f35b9/pipojetabekozananonukelat.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609807d438924---24302519893.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/76736606066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=staples+spl-290x+12-digit+desktop+calculator+manualPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/629718e0257398c32006f814e659a1df/puzaga.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_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 19048 bytes
SHA-256: 8042398cd2e529a2a6309662b2207c48c73ce42a94c6a68e4b829c89da566313
font_01_sfnt_off00013212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13212 11720 bytes
SHA-256: 3ce3c443e314503594e3b9d1281897cee1ff41d589312cce902a15c167b95a0d
font_02_sfnt_off00014dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1