Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59b39cb2d8a7fef…

MALICIOUS

PDF

94.7 KB Created: 2021-09-05 20:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0dbcbb582c4009e88679a0dc3b16d178 SHA-1: d8e616dd120197c1853daae34ceb9c04d14ada9b SHA-256: d59b39cb2d8a7fef3ee78c0b95f7a44761af2ab74a4ba00e9ee71b2385bf01c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=plot+pdf+and+cdf+in+python PDF link annotation
    • http://thecreditcrisis.net/clients/73966/File/fesunomusuvufi.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/31100455174.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cc921a41b---rufegotutazenadosumefevo.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/gijagep.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/romedu.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/34600607522.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/wudemez.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/78549ae1d985570442585bae7630217e/49869714805.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/83402209217.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16107c1d8bf666---40455898023.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/luxelularinev.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/5b3dcde185e18e5f7c5c9423d93a2c1e/5298969213.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/98866675684.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc2ac7181---zobojep.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/72970957599.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1360e2271691f64fd8da2e40ba1c3db1/19096213533.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d33d881c4---49544518879.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/28130055717.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2d8fd2332---vozagugodob.pdfIn PDF document text
    • http://protok.pro/upload/files/34573727726.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/bapirerim.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e423c5b83---lajiwakefego.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_off00010ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F7 19620 bytes
SHA-256: f0f92f6fd0fff7727a5ae5581b233988414a48bad30128c7b71c45174f83d8cd
font_02_sfnt_off000155e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E1 10432 bytes
SHA-256: 6cd901622b563b714ff5227ab99390b914d8276861f7ee09324bef77047b627c

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