Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39442784fbbaeeb…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 09:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 776b12ae3d4eab516a0817fe64491bbd SHA-1: 4c8e9cf76f0ab9fffdaf57294c9837e682665d64 SHA-256: e39442784fbbaeeb7cbe5b35663e474aacdb3a6c1ecf5017687f9e544c9e06c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://candientushinko.com/images/file/navavuxuwasakuga.pdf
    • https://glearningsolutions.com/userfiles/files/xebewunejipisozapubukasa.pdf
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/lufirazefikazitozozaseg.pdf
    • https://ccaquebec.com/userupload/files/lidikukaderal.pdf
    • http://irvine.songhakbbq.com/uploads/files/sigofogitadiva.pdf
    • http://jaqalsports.com/files/file/92901366291.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161452b26d906f---54124669633.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/noveki.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/a67d88a4b3eb238140199af8585bea17/62595017000.pdf
    • http://zge-led.com/luodan/images/userfiles/file/fojapijesipopovusimuguma.pdf
    • http://theheavent.com/userfiles/files/33766595755.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a074cdf83---15043620821.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a09461628---91779404124.pdf
    • http://fobas.cz/userfiles/file/pigunidaxivuk.pdf
    • http://gamax-motor.cz/data/dokumenty/65873438894.pdf
    • http://gamax-motor.cz/data/dokumenty/1233501435.pdf
    • https://soyana.de/js/ckfinder/userfiles/files/72696767434.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c60b2d9c43c697c9ed7078b5eb2d69ce/57040016722.pdf
    • http://praconsulgroup.ru/pict/file/jiratezogedubolurebexaw.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4af883df3---temeboxegusavivopagupi.pdf
    • http://lawyergz.net/uploadfile/files/gizewuramadamidok.pdf
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/divigafugufodutotuboni.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb840bf0fe---tamigamirugel.pdf
    • https://muzpony.de/obrazki/file/22814117095.pdf
    • https://nusamulticentralestari.com/Uploads/userfiles/files/xakemusazatowe.pdf
    • http://gostinica-domodedovo.ru/files/nejefotole.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=watch+instagram+stories+private+account
    • 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_off0000b2c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C6 16792 bytes
font_01_sfnt_off0000cad8.bin
11db8ddb2d8a6e53ed5ce28d3dcb008429eb301ec2d74d1c48a90e59fe51684f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD8 14664 bytes
font_02_sfnt_off0000ef74.bin
9fbc6bf83c1ac7f915d8922219ff150d907187b67760daad044f078d0c6d7808
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 10936 bytes