Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d9f2ceb03d9c5f…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 17:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20778d504e827745fb4d8680e4051898 SHA-1: b066316d3dc0fd8e1f132f0e285104c9af07d799 SHA-256: 56d9f2ceb03d9c5f4003129af56ee821b97eefd86309c0ef366d9dee7b4461fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous links on disposable domains, often with 'utm_term' parameters, suggesting an attempt to obscure the true destination or for SEO manipulation for phishing lures. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hermandadperdon.es/userfiles/file/rixiretenizagore.pdf
    • https://maconlux.ovh/userfiles/files/56745552043.pdf
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/jomurezegiretuzejigojab.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161493429f0ac9---zezopipujanoda.pdf
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/65098831455.pdf
    • https://berbagiangka.com/contents/files/55021746839.pdf
    • http://bjjiffy.com/upload/kosotal.pdf
    • https://mbp.hastatis.com/mbp/upload/images/images/upload/ckfinder/wiwasutoworakebobukek.pdf
    • http://ildong.org/sa_upload/userfiles/file/20210924133838.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613216dab166e---36011885523.pdf
    • http://jmk.kr/ckfinder/userfiles/files/3330632229.pdf
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/9183501700.pdf
    • https://smartmedia.ro/app/webroot/files/userfiles/files/jejaz.pdf
    • http://serenetour.com/image/upload/File/xutatixagupokujavid.pdf
    • http://futimisdev.com/userfiles/file/89062942476.pdf
    • http://ikuma-car.com/js/upload/files/28347385787.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147c477e0a72---89314122093.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/xibagukibobekotilud.pdf
    • http://jeyadhurgatemple.com/userfiles/file/binotoloxesi.pdf
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/61712400836.pdf
    • https://profession-your-dr.com/uploads/files/202109240954115240.pdf
    • http://artattack-concerts.de/files/file/pazabomopigonitanetonaxe.pdf
    • https://lostfoundglobal.com/userfiles/file/fifunijanotupukaxiw.pdf
    • http://spharma.ua/files/file/nezixola.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=gift+card+gen
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b18c.bin
ea874ca81372ae301a7355061b3ee4db36120df6d6d255e73533d967c7a9be28
pdf-font-stream PDF embedded font (sfnt) at offset 0xB18C 10356 bytes
font_01_sfnt_off0000c8df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DF 16792 bytes
font_02_sfnt_off0000e0f1.bin
878a4170384a4da6b1c5b48e3976ece9134920a6a28e975431d47c666c2313c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 16696 bytes