Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afa02c8d960b463…

MALICIOUS

PDF

68.4 KB Created: 2021-09-04 07:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f4b5494a8abda11c4099536b0165238 SHA-1: de4aca616d5e728853bc0486142538439cadbccf SHA-256: 6afa02c8d960b4635134d9c4b1dda86efaf60eac4e4c2c6b46a4ce5e0594ca47
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised sites to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://vleek.com/uploads/files/xidofufujosenasuguberado.pdf In PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/51255329081.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/93d605805edaad24b903c1ebabbdec3d/vanimonevorewin.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/50582897911.pdfIn PDF document text
    • http://torgoborud.org/images/file/neketetodepagizi.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/zofexejidesoxipos.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/31789899520.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdb92454ea---filafijigozizi.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/7579545366.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/n2553q6sip4uj8thprr589fgc2/xomujezixuxivuxurirof.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/jozir.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/23975062516.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/80178235012.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/c49c1330b3b07470fd81cc6c13ab0dec/garurofazapuzelugoj.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/nininuduro.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4ol32teqoufoqgrush9e171pn1/sezasazolola.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/segomipetom.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7703912f0---13908392168.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///39148013456.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/buwukoma.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/tefolefidoxotole.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/lidetipufakesewojuviz.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16111a87fd6435---85122350835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fables+and+folktales+worksheetsPDF 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_off0000b03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03A 10652 bytes
SHA-256: 68c66346389df2b1269b9b85270cdb65cc3e332494ce8e7e9a097de6a4cb34d6
font_01_sfnt_off0000c8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A5 14168 bytes
SHA-256: 15d89222f57722f045f9aee96540e8a645a5461177b81d1d9f4f41ee4c8bc580
font_02_sfnt_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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