Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c679ad880087ee8…

MALICIOUS

PDF

85.3 KB Created: 2021-08-30 06:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac1bee5641c86ecdab892dfb90caa94b SHA-1: e5410fccc4d6fe3d30484697684958ee94f10724 SHA-256: 2c679ad880087ee8306d0fde0373d899ebd93caab6aab56e29e68fa50bfa705a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress upload directories, suggesting an attempt to obscure the final destination or leverage legitimate-but-compromised infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160fb13402719d---36561461717.pdf In PDF document text
    • http://gsxr.hu/userfiles/file/75936726999.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a369673f1d---32034020902.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/5361363425.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuguzatajalujuti.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/1229800552.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/97219891343.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607890ac091e4---bazerefu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2ab0b8b36---divebenitidolobixewil.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/vunuwox.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b498a6a2a34---lutefelunepaniboku.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/26209751215.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/v9v6qmjrgo7iqgtjkpbdkjoj9a/fekobopiva.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48960580f5---19029790529.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/89572686545.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/48669420470.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/86452629700.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/lorabubi.pdfIn PDF document text
    • http://poorclarescork.ie/images/faduxusafubegajupozonet.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/mitonigipujaxojok.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/guxebofejilosolilelewepek.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/eff49e69a53e53b50fc8202993d49fbe/xinijufojofe.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/23558165662.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d528f594f05---48099521099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=professional+picture+hanging+near+mePDF 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_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 11028 bytes
SHA-256: 87cd2a2809e0a665899f5b5c14f10ac5a923b70dc369d56acdaddcabd8d70f60
font_02_sfnt_off0001171a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171A 18088 bytes
SHA-256: 0b1a87220eaa96315dc69161d460030fc4d73f23a59e5583025966be70e15a3d

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