Malicious PDF — malware analysis report

Static analysis result for SHA-256 723857c42488e160…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 10:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f66c8679a6ddc947c32e5ffd5b13160e SHA-1: 1a2b61f25188a48364b06d274faf16ee78c3afdc SHA-256: 723857c42488e160574f5165d64b583b5dc45cc866d2648ad514a0a4042acac8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://banglenhospital.com/UserFiles/File/89813124303.pdf In PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/202505d4821bd3335b92425530b60446/xixirefogofuxipituz.pdfIn PDF document text
    • http://bwc.lt/i/lakidanevoga.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ef3c1cabd87cb592f2a1dcf04c1f8840/67647529938.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/pkpk8p640dsf998hq09udt12dh/6104176690.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/31025428958.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/redejusedoz.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/baxadirizeledar.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/4995133313.pdfIn PDF document text
    • http://labonscafe.com/userfiles/rinuluvisov.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d91f9b73af---pobigokemajuzux.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16129fad7a3551---56992917643.pdfIn PDF document text
    • http://coatsofarms.com.au/ckfinder/userfiles/files/sexologagubebesizeseviw.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/p0v4rtvjg9p8256q7kf68mdn96/rerelanalexanidobika.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/38440988094.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/lumivapebupofofu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b58f639d2---17838564460.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/bimurojatewinikagu.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/dc4acd068f6aa5a4a991688e79835a27/28678288249.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/zudarigibuvapiwem.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/28385307870.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/92845217160.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/bunogilebamelu.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/47305429946.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d70eb451b0000b3c453c1d0ec5a2e76f/dufanebu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/1dc1b8bc7575f612fa5f27ed884bd26f/40102437147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=worksheetfunction+vba+matchPDF 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_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 18640 bytes
SHA-256: ac4475db29bced246b8277fe3e7de7d3685f9056ddea9481f5cf0b0d9500809f
font_02_sfnt_off00012363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12363 10944 bytes
SHA-256: 3a8ad3f30473feaa9ee06deb598ca89aa04534720505944cadec687cf063b4db