Malicious PDF — malware analysis report

Static analysis result for SHA-256 d629eabf623a7b7f…

MALICIOUS

PDF

86.5 KB Created: 2021-07-05 00:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 667513815256948966aff2b1e38e1ec4 SHA-1: d2e1e2866250d717068f17c3ec3570aad41ab4fb SHA-256: d629eabf623a7b7f7625fb8fbc9e2a9da403b431b9397d1c87216a3bb2762397
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent. The file's structure and URL distribution align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2b67a091b---81415210560.pdf
    • http://capesociety.ca/uploads/files/werupisabarixefadot.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ghapbhktmcr20ie5768hh9i1ra/gojupibepusil.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/netomifadexofamomedupi.pdf
    • http://zatoodesign.com/userfiles/files/38631050595.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be3d117ccdc---nemuxepisire.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c356b8a84---60691132396.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084da77443df---22831919258.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16089b2b66f12c---42699056320.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfbefa7cdd---85896830755.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab0e206fb---20118583753.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a0282e34884b7fecaaaa5f20417552fc/21360221528.pdf
    • http://delannahotel.com/user_img/file/diboweboxalu.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/iuadmmuq05u8dh2o3krjacf7g7/37194607045.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae05864f0---nebizemaxuneweneroma.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087344f345c0---25421067254.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c7e347ee9---tilakuzofodakupawobal.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cddf3c39ef---9074742141.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c498617810a---22517397441.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/94a71ae62def10b09b6bdd5159cc497e/lizusevoze.pdf
    • http://fujavietnam.com/images/Download/88682995477.pdf
    • http://aawyx.com/sites/default/imageuser/file/90109544738.pdf
    • https://bouveau-consulting.com/userfiles/file/28448108757.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/971f2ebe8102f3ef50ff1bfc7498cd73/xulabosinivolapeku.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/efd62d36cc6ac76a9d11382ca3abae37/vibixumewanamudinoxuk.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=concept+of+agribusiness+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 16792 bytes
font_01_sfnt_off000107af.bin
f204e2b69a8650cd1c9b8d4fcb5bf5e8b34976694eb12b5c975810c09c78ffb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 16688 bytes
font_02_sfnt_off00013339.bin
d6b0f26f06611259d2d23e7a31940a89453be449cf62bb6c2e34ee4eff0c0774		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13339 11020 bytes

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