Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb922f91c83490f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-01 13:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ac49c764bff13ea979eefb2c2513a16 SHA-1: 40aec3cde17e5bcc5e2c3d23085728cb59d4c967 SHA-256: fcb922f91c83490f8ea1895c640931e00e6d96a90815af1cfa1a186ced3e400e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains embedded JavaScript and a link farm pointing to multiple compromised websites, likely intended to redirect users to malicious content. The presence of embedded JavaScript suggests an attempt to execute malicious code upon opening the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/uplcv?utm_term=colonic+services+near+me PDF link annotation
    • https://acryl-bg.com/userfiles/file/43223438693.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/82196322928.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2f446993131a71f99fc8fd439a36ea70/12297580012.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65385a586d---gotanaxizaberisot.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/90541919133.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/67b7ad983d8a85cfe68ed187609082e3/66372044748.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/76503844076.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/medefox.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/mapanefoxivetiravug.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/7b270d207186cae2170bc6db57fa4ac4/80895851583.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/2155824054.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/minapitevi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f765f6e1b8---jikepubepelexejexuzifin.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/30421369303.pdfIn PDF document text
    • https://digireg.dk/upload/42621647131.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c488ad21105---81342518633.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f2db2b7db---754300815.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/52572471401.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/86016639528.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/femobixefuwafaput.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/niwifemirale.pdfIn PDF document text
    • 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_off0000d5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C6 10392 bytes
SHA-256: 3ef380c945baa3518199f45ff3feceb8bd4e95d2d57a83c04572bdefeeab2d72
font_01_sfnt_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001055f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 17096 bytes
SHA-256: ee72fc49cb5f6c199478a3d8b83e43ecb9d580064c625dc12f96febc3ce761f5

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