Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfea49ecb5f7bd41…

MALICIOUS

PDF

93.9 KB Created: 2021-09-01 11:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f73ffc70aef1882712ad684636a5025d SHA-1: 126e44bce3b09e1e4dc644f70265bd72573a638d SHA-256: cfea49ecb5f7bd4107b2f7d740b4a94ae9ee8c4ae244ee8b39cba099dbf1ed0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/09eimptv7eap9vi7rcbi18tpmu/rukufurokerenesik.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7f30a34c2f71c9940bedc48dcb998700/tegegidikovagufunepun.pdf
    • https://luyenthitoeic.info/userfiles/file/zojivivizowezoxevumipog.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a001353da14---noxipibowotimogozo.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ce877e20---16798843310.pdf
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/leraranamozatoxin.pdf
    • http://arslanemlak.come/file/juvevex.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/614f56f85610192ddb2038c36886beec/gaxiru.pdf
    • http://churchtextile.com/userfiles/file/movetifikagefa.pdf
    • http://medrea.ru/upload/files/45277902071.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160947d79bb170---3500573761.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161241a4a78b98---lukimokipazopelav.pdf
    • http://lucann.com/Upload/file/wapotimelerupa.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe9f21845---40326586758.pdf
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/69130192133.pdf
    • https://bocion.com/ckfinder/userfiles/files/23092690043.pdf
    • http://21cedu.com/pds/userfiles/files/92004607709.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/31141999602.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/80195584123.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085a5e18fb4d---mizutiw.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/157b47cc5ec769c32872d3d7ae7f0bab/96637155077.pdf
    • http://yameitecl.com/ckfinder/userfiles/files/20210822_005726.pdf
    • http://ilsogno-bomboniere.com/userfiles/files/3763027421.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf504a0c59---56201842006.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+cite+lecture+apa+in+text
    • 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_off000106ba.bin
755d0de3e10fd8169b79ee696848543e271eaf4232066d47a4b46f7b509d8fa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 10480 bytes
font_01_sfnt_off00011ead.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAD 16792 bytes
font_02_sfnt_off000136bf.bin
7ba11aa007a3021b4dbdb95f391dc40871c3fe3587efab33bda0fd6f73d31398
pdf-font-stream PDF embedded font (sfnt) at offset 0x136BF 19368 bytes