Malicious PDF — malware analysis report

Static analysis result for SHA-256 393494ec0cf8079a…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 00:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2266222e9656f1f25ef2253aac82ff8b SHA-1: ba378bba44ab300cf7d4cdeeedc705c485df4f07 SHA-256: 393494ec0cf8079adb754fb48449a078e5efb7f756e345821d98dfd2bf6dbcbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, likely intended to trick users into downloading further malicious content. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://fusheng-vietnam.vn/admin/webroot/upload/image/files/19351634881.pdf In PDF document text
    • http://firewheels.pe/userfiles/file/jalarejujakapivulejodod.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/bc3c54a960ac8f5823ce27bbfc57fdd5/joferiv.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/u826pj5ggss6ooaeemagqthi36/gupawagus.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/buzetumijukovinuv.pdfIn PDF document text
    • http://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/kupixikegukasape.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/jazilonigosidibiforituw.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c68817f7d8---finumokafupalalema.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/makepizunepu.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/66952799604.pdfIn PDF document text
    • https://ksuskalology.com/images/file/gogelemelafev.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bd603c0e9---32662525466.pdfIn PDF document text
    • http://vce34.ru/attachments/file/47713371543.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/lupebus.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/zuman.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/19335239791.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210621014457_0r6zgv.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/3f2e70231ed687be9710173e98afc981/divuvibogomimaji.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d98f699daf---16872561005.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873815e6c2d---jabafuvanoreziwidawizu.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d350f2e0f5db275e2c6f610f89ad0fa9/59816766330.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/dovipogamef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cute+pdf+reader+download+windows+7PDF 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_off0000d941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD941 16496 bytes
SHA-256: fe791bed66337db055ed3467f20acdd75d4fed53e7a0deb4a49f8c8fb8f75208
font_01_sfnt_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 10760 bytes
SHA-256: 3f0c8ab3487cd1681832c78acc6c05dee92ed488c17dd29666b2b83c8d15c840
font_02_sfnt_off00011cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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