Malicious PDF — malware analysis report

Static analysis result for SHA-256 1231ec7edbee33c7…

MALICIOUS

PDF

77.8 KB Created: 2021-09-12 07:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e7ed94d253605a2ea00ba72e540401b8 SHA-1: 4da24e35ef61a41c0ca2220e28aa0d467ef4c4ff SHA-256: 1231ec7edbee33c73fb501239e29b4974e46e7a89c50f6478fd74b57da0ce905
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple external URLs, some hosted on compromised WordPress sites. The presence of JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ewastexperts.com/userfiles/files/90189398934.pdf In PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16136e4249abba---68130881666.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/43283927023.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/dofirawategasuv.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/42981474203.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/kilubojamapataxajejike.pdfIn PDF document text
    • http://bociany.sk/media/file/24682566865.pdfIn PDF document text
    • http://mariancozma.com/_user/file/jolumusopis.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210911_50BC859D997F0523.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/95171318436.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/gubojaterewomewodije.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4b239be3113124268971f792e447d2b9/5400108229.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/74596599837.pdfIn PDF document text
    • https://fratellifurloni.it/file/40291682393.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/liwawilo.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/59409427301.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/47621725274.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210901_E6252B5B348015B1.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/tu8r3upkhm0sj9buklb17roi71/17800109441.pdfIn PDF document text
    • http://htygroup.com/upload/files/rarijikodupamex.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/lokajapu.pdfIn PDF document text
    • http://skncn.com/u/files/misapobiwokexonameko.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/mevabubotemes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=time+tracking+androidPDF 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_off0000cea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA5 10552 bytes
SHA-256: ab72515dc4e6c1b714b184a8d88c5dfce5148cf1228d54810b748b16a2cb03bb
font_01_sfnt_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 16680 bytes
SHA-256: b78a5529b48413718485d6346f0bb86e4af4160aa727158142534f441307ba47
font_02_sfnt_off00011173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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