Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6aafaeed6b47d8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 00:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be607ffe8e6c73299a7c3acba817c5e3 SHA-1: a2e1deb6542f16d8ab8bc5153ebd68b41af7ff82 SHA-256: 9c6aafaeed6b47d8f74bd066d20210b9fe244f5edfaca2d7cfe9bd748e1b21d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to compromised WordPress sites and utilize UTM parameters, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the heuristic firings suggest it is intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=manual+testing+and+automation+testing+interview+questions PDF link annotation
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16124c30d5461a---sapigowowulufesadakur.pdfIn PDF document text
    • http://charivne.info/images/file/jesoxi.pdfIn PDF document text
    • https://silga.ca/userfiles/file/1810637021.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077188fe114c---nekasasefifujuraraliledub.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/54080078145.pdfIn PDF document text
    • https://oliogalanis.com/file/mewifagape.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3dfe0474---59870113748.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43585240c7---3243411135.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/86504131953.pdfIn PDF document text
    • https://cartolmania.it/file/dujowikul.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160fc1b6f69551---pafanijuzikewalopinu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07246ccced---musepun.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/jufvf8mf4crej5tnc2nurqkrtq/xokugomajuronexuz.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bde49602ec---73159924397.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc12b666fc---xejofo.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/26119718083.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/situkelorepadaworukabosoz.pdfIn PDF document text
    • https://htapigroup3.com/contents//files/duwudevudosavekewejesavom.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b708fac1---bewijo.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/93183673230.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/27391744149.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/jamexilolutewesosoxi.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/21960065720.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_off0000d9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CB 17676 bytes
SHA-256: 2c48d0708ff211a5c7fa8f2c72fac53283f4c531df47f7628e8613ce6b411469
font_01_sfnt_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5F 10980 bytes
SHA-256: 91e99ad9cc70b70fded636b0d323c5c039d403aa461237304e2de01b5ca13692

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