Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdabbcf813acda5a…

MALICIOUS

PDF

74.6 KB Created: 2021-08-27 23:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6fd3cc95431e1e99a93555764c4df7f8 SHA-1: 5083679b0c0ed67737e047bea2aadd619129994b SHA-256: fdabbcf813acda5a3001074a088140014bcc71b0eef3c630d369e49156833ae6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farms, many hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded links are consistent with a lure to trick users into visiting malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://chcial.ru/uplcv?utm_term=the+architect+in+practice+pdf+free PDF link annotation
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/umtgj4te0sudpgd2bkdnnch4iu/19646285518.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610b849e66403---7026253595.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/45264736834.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/pekosa.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/veriwudoxawosipiw.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/9836725807.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/97lu3121f4m8jq3r55ogiqile3/vubemet.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/km1jql1d6sclhdfkqeun73ejdh/nafafuxixogafo.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b78518f4---gomufenavaxate.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/9qondb9ckckge8qvqaau4imscf/75209105415.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6a621059---14555053982.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/xutosogupewujuzalosa.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/texuwiputadetakizaf.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2735f36d0---mukisawaz.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/zebuwuterazetuk.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/doradeker.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/010322473165.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/88875148258.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/bfa297d5ad2d62aa83cdea72a2521019/kajinumam.pdfIn PDF document text
    • http://sdds.be/userfiles/file/mupugajapoka.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0394d3780bf64dc2c12f507d525aa88f/diwulenagigubapovi.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/filewurenapedeso.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/jonatidom.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_off0000c34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 16212 bytes
SHA-256: a3af9e2d54f31c2241c10f3ac4fbffd4d001491cccde5294d248df53daf91458
font_02_sfnt_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 10348 bytes
SHA-256: aa0a86600e3f19660114261f4144926f3f87b25a851eb100c55d7716543b73d4

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