Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ea41b870af60ec…

MALICIOUS

PDF

95.4 KB Created: 2021-07-20 21:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2de5d8bca69311664247772e30703488 SHA-1: e702c4cd3cb817bbe632c18f579cd56f7e6f5e89 SHA-256: 46ea41b870af60eccc577f5ea88071d411a26b69a4076332d859be3f285741c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. The primary purpose seems to be redirecting users through these links, likely to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fqcd4sv1ggrjkpmmjdi06nslu6/70524799588.pdf In PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6003d84f6---mavewotilewiwogixubat.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/13787123434.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42723eab78---pajasurudawutanipalitinu.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/86f5a826653ca704a21d49f7e3e48933/29014783455.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/15950880754.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609520a2d74e5---watanap.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/98195443258.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/mividuxodovejox.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/hhti0jng0datd2phpqipctoi9a/15449810233.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/81kq1achhcpt3k0cc0ibn5fc78/92610327066.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6968b6542e637c166500f970a51a10b1/zewafidodexiwowoj.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c77c61416fa---filivelazumobujipizopu.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/konamix.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b1dbdcf4---witejogajilu.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/benusuvogawelopeweragi.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a18fa8e255f---gokepefakimamesaletuk.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/gufepefojopuk.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607640ef5922f---89851861695.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f11df9aebb---3536137975.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/mugupofaxizigetev.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/9565037e2ef0e4acbbb802fb50cb044a/bujatazinetaputofoguliv.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b213b58f3---8283673059.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160836fc9a1d35---kiwavar.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b47b9b4cd8---11122914837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=fundamentals+of+chemical+engineering+thermodynamics+solution+manual+pdfPDF 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_off00010cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD3 18288 bytes
SHA-256: 4a52b26860f8146f4ba4a2c8d790f0e43ec73399c199190ef7ca71737241e553
font_01_sfnt_off00013d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15573 11256 bytes
SHA-256: 4ccdeb78f47d0c00574f4b6189d2f165387052fd17610a6beb8f56142c6997f2

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