Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1cccb58e8c2c0c…

MALICIOUS

PDF

85.6 KB Created: 2021-06-28 03:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21739634ed3a70519989ccab25b605de SHA-1: 87b42bb13aa71ec8a4a1f8df65a85125e5a8447c SHA-256: fb1cccb58e8c2c0cd6b52e4c60f323cec89e1bf6fd74b0bcb690077867112939
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads, suggesting an attempt to distribute further payloads or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

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://bearings-home.com/userfiles/file/majisikefezaz.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609407e1e7cb1---9651012649.pdf
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/dijatobamevijibilenojope.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d71c4acc55---mukoripawosew.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d569fe5e94---wubepexopokunozasudaloju.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/ffd924a1511408031a3b891630d6fca5/2557021489.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ace5509d56---vipizeseduro.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ivg1r137p1soofs2tigoidhhkl/86416886473.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/655e64b65d72ed292ad11bbeb985e14d/nowiwinitalunoluz.pdf
    • http://chieusangducphat.com/uploads/userfiles/file/19544305821.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9e5e79afbd03cd92ee2d9d823cd2ef48/bopokodotulafisa.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e266442ab42066b75798558b93d81c5f/24750190455.pdf
    • https://xehowo24h.com/images/ckeditor/files/liwijej.pdf
    • https://agencement-menuiserie-var.fr/stockages/files/29027521607.pdf
    • http://ilksolar.com/Images/Media/files/kefanivezitowololifebot.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/9dda0fe86a7f46947cf475e5d762fa23/kodomapidepumijifexalojuj.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16094b92c910cf---taxunadezisudidunatamofig.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/94bbe05351d3ad76d79abef0dbd78e63/75540450273.pdf
    • http://ddservice-bmw.pl/userfiles/file/29788590282.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/30991514257.pdf
    • http://vidol.nl/userfiles/file/jarazaraluxinobozam.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/92b1a141940bd2492f4c157c2209480e/lilavezalexo.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c969fba6e49---nazikedemoguxomigotoxojum.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c8bc3ec14---83402434436.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=30+seconds+board+game+questions+and+answers
    • 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_off0000e7ad.bin
9cad8a02186ffe8bed4aa0de40485d033cb7397f1e794b2220e860273c95e175
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 17820 bytes
font_01_sfnt_off00011695.bin
fee05203cacb29946337e064e0af343f68dc5134a9a044787084b29e69d7ceb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11695 11336 bytes
font_02_sfnt_off000130ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130CE 16792 bytes