Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3b59b864d1cf35…

MALICIOUS

PDF

77.6 KB Created: 2021-07-26 19:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 42d35a4243a5a4118af85087d6d8e66f SHA-1: 30c1588505364bb43e6efe059af09cbeb584c6c3 SHA-256: fb3b59b864d1cf35c69a668982a254aa42a660921335d7cf3a1f94854b68642f
164 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. The document contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. Embedded JavaScript was also detected, which could be used to further obfuscate the malicious intent or facilitate exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f0a3062f4ca2a714481dc2e2cdf9c61a/dojozijegutag.pdf In PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d058621b---voxeluzuvunisijeli.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6989896abc---13447207633.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/84617864549.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/nesoxuwodewedosoduritupu.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a33a01cafc8---42910127605.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2880305be8309bc98f31ac4aebd142ac/12503291961.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/tewurama.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/lonikirenamusupofuveti.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/mibaxegerulugosatakutowa.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/qua3nfljje695v8h0v4tl90aa1/zebejasi.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/e96f400mdknh8fv582p74mm7oe/laxizav.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/7485dd541675c68901afb0548cdbcbd7/dilomifegewek.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/36ofakut5bk89tlujc9t18s9qs/56276301641.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/g39dj1nqv307kb37ve8po8ese0/jukuxulabobosinelegulez.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/11f93dd5a3020282cdddb214b2d37f44/73703331033.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/40526929337.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/4582042870.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/872189375.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/gixawevuxujokeweni.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afc114aadb8---77094965752.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4aea8ca4a---dawapatudemitegu.pdfIn PDF document text
    • https://digireg.se/upload/laxutidofesikafofiz.pdfIn PDF document text
    • http://thongthien.vn/upload/files/rotasokibewa.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/99045603320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=murder+mystery+dinner+train+fort+myers+flPDF 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_off0000cc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6C 10720 bytes
SHA-256: c8731a10042583437ef12a6ac8cb7889c07e43de01b9bf38944505f4183421db
font_01_sfnt_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 16552 bytes
SHA-256: c2cf5ebdb3f943d8ab2e3a202edd8afb2cc40f03e86888603088fb22cea47d59