Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56a833a0b1c1b90…

MALICIOUS

PDF

77.3 KB Created: 2021-09-03 00:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13549d7d974e779e49b84bfec6ad67fc SHA-1: 1fca7a13d86aaa4c8bed77d57baa9b311120a137 SHA-256: c56a833a0b1c1b901f9fd0ea746cd82859274b45c1c9d89436719d5ed3616465
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://paoladebenedetti.eu/userfiles/files/49215018257.pdf In PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/a863e557a163dd3c111d0334dbab8d6e/pazebomadajoza.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/tanomodogevixefafus.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/95908992901.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/jofarize.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/95429190119.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/75249114422.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/kojalalevonuxusepogofono.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/dexulizukejiruliwisap.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/konapivosefewobometoda.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/bojawosoloju.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jtah9pisa10qo8k0mb0rded4cu/51275070942.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/38714977581.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/xutujelisi.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/kopapewixowuti.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/368517fdfb238c1926632f3c3cff824a/34347749748.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/51574817754.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/66326509442.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/bibufepuz.pdfIn PDF document text
    • http://mosjob.ru/images/file/44050377524.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3f442a974---nolupe.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130250f99b31---76290607402.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30340069950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fire+fighting+training+manual+solasPDF 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_off0000c9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CE 10736 bytes
SHA-256: e9120a6f21cc9ec78dbbd531597a1124d63327115fcf90f0aac5145dea43327e
font_01_sfnt_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 17608 bytes
SHA-256: 05139c1018cab6dcc695df2b9c8bb8f99e44bf7e0ca760cc2f86d9bf10d0745c
font_02_sfnt_off00010f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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