Malicious PDF — malware analysis report

Static analysis result for SHA-256 f771038caac70878…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 14:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 609eba44cf17647f2f9b723357ae03f0 SHA-1: 0acb82067a35762de90d6ab80c23c337b7af7203 SHA-256: f771038caac7087831265fc3a15990548204a8725304180d52cfee641d57d25f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these compromised sites, which are then used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe660eecbf---3025651536.pdf In PDF document text
    • http://alliance-ltd.com/userfiles/xibodejazevaworexijumat.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/36610356521.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c1a6400d9bb68d199f4ae3f5fbc59e2f/23082603799.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b10555558---51056581379.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/84691727758.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/df89490de09a9188f72b276667ca002d/13491580227.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210630025629.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/28144444288.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/mafodajonubonagiwixubexog.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/kulatad.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/6a424b94eee93abb28ef09eea558ec84/sepev.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jokanofawoso.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/jefafulafinenaviwur.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/jetedawaxataz.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebcff509d4---darimetabirelomitetana.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160fd254a6df12---delejuvojut.pdfIn PDF document text
    • http://mega.kz/media/upload/files/wugibos.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/0119936547604935203b180745c0e134/50754014384.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/vubogofavusebilekufew.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/88484507451.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/712a14267b477576439a8efc48b00c66/97267864961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=altistart+48+manual+englishPDF 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_off0000da23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA23 20160 bytes
SHA-256: df86b0b08e7af4e4dcf6a49dd32183304227431c53e6af6a7b3c2c6a4fbad4f6
font_01_sfnt_off00010e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 10800 bytes
SHA-256: da103d33dd268bb1b0a1e49e9bc40c6e1c289661e831b1eefcc5d5b7d7dd25ad
font_02_sfnt_off0001273c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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