Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53d8380c0e53f61…

MALICIOUS

PDF

213.8 KB Created: 2021-07-06 07:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 968f15aae2165546673f98eb8dd943d9 SHA-1: e116a940ff897e88d7e6b1fd99a4efd774b4a424 SHA-256: b53d8380c0e53f618e056634dc8ad618123d389f7b009b6b7c4c9b4a73cd5fa8
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a redirector identified as an SEO lure for free downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9470

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=end+behavior+of+polynomial+functions PDF link annotation
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078764159d66---30026761665.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9dcfce22a---nujojeserajadok.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/1705149786.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/zaxepawudozodijoninijatin.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d7eb950ed---75543773089.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a2a55b06f---35395810146.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a74a9754027---bilegimozoxenuzefudep.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae13004ec4a---lizobapitixanotovefokuru.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a59215181---revatovusenalowuguzemigi.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/xoluzeber.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9e5cuqhj6js06hocijtjrfhc80/bujodazesadexabezu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16082eb71eccb0---linow.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/99195469009.pdfIn PDF document text
    • http://4bx.pl/public/file/16678445970.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/14690844479.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/73547955102.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/rojewomusivulanigipaba.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071661c2b3a5---60553470097.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/muzap.pdfIn PDF document text
    • https://edarky.net/data/file/82796359352.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/27331067216.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1099c52691---13077208908.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/94950191988.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/bewinodoruruwubegegoviz.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/mifabumugeni.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f4ba9b56c---totadivujawagoxalofavin.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/jevebuj.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002ccf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CCF0 16140 bytes
SHA-256: a1a119a537d0832ca63963c8fdd84b71b1b15a93d2dbbad7416bba59116e8d01
font_01_sfnt_off0002e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E24F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA66 11288 bytes
SHA-256: 3a80fa270e2d8aa86fe4bccbb23726577d4915138882b4e695fd304d716ecb7c
font_03_sfnt_off00031485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31485 19800 bytes
SHA-256: 403be5a048742f00506d84e7230b9f2a7c3370d8599c0f2e6c849b15ef43a4ad

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