Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a246e2bf28b773…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 04:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20a5e9c684527f692329b2eecd59a422 SHA-1: 9013daeb63bec5356acd1cec3b10c2b9e667ca27 SHA-256: 64a246e2bf28b7731f9fe0bd70773fc6e1f073030574825bf4080c552bdb7e54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on compromised CMS uploads and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ronaldtan.nl/images/photo/mawofikerozobok.pdf In PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/tebigixuso.pdfIn PDF document text
    • http://trovas.com/userimages/jemugonizepa.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/pubegoxopomenoxonusezijo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072aab303b5b---70041361191.pdfIn PDF document text
    • https://maisonforville.be/documents/file/gatuvul.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/77084108475.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20218171133453919.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/15158398114.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d99828a057---97442821650.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/fijidogaligajizutefixe.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/3f97d7f43905de237856a4c0593fe035/54499148186.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/rimomowobolefedagumiz.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210817043801.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/68148832025.pdfIn PDF document text
    • http://co-mit.com/uploads/files/komoladafiduboxudod.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nirexesubajumasudewop.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/5617739553.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/9514706988.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/zipuju.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/23922000367.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-07-14-08-20-31-nGrJGkhS.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/14453770950.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/221ab22f05e05ae93975bfeb28fb953d/vebofolukumumakonadigog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=bastien+piano+level+1+pdfPDF 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_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 18116 bytes
SHA-256: e53d7735b52644bf61bdbba720767e2a4719375b010eba957ced8d181b0d9905
font_02_sfnt_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 10564 bytes
SHA-256: 7955756172b80dd7a078e5346bc5b8c53fd1b80f0378c8e32d489b8cf25ad1d9

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