Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5306313669e8d69…

MALICIOUS

PDF

97.8 KB Created: 2021-08-19 09:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 4c1296c7af7f54a4545b0e297bdb846e SHA-1: cce010ea1370bde8d00597e48fdf69f8af22b0f6 SHA-256: a5306313669e8d6901dedc9ac02cf3b6a32acadcfb61e62ed0511b3a33185c39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://catamma.ru/uplcv?utm_term=propiedades+fisicas+y+quimicas+del+mercurio+wikipedia PDF link annotation
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2cc680b17---sisipekovetawakulovuviwe.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/55645561195.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4806e7323---21507722524.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb403eb886---54503906138.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22f988f19---logewebetufubofux.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc9ed94f4---82474259814.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/bonopalixaw.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084d08572623---detavotuvujo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608edf8a3e5a0---70839468428.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/3ac52dbc57d67ea376b2ecaac9f2abda/28123443074.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f9603171886e066fb4cd609fce3979a1/86215737395.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/vedopofanagolaxuz.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/51409379307.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/9832954599.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d03a54a560c03b19674218509b25e633/tepazon.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/648043cbe3df5378f5c5849075f7280e/95542391100.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/mejogovivoxidalutad.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/sexedeli.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/a972ca83f7bb4ae77957ddc026a13ed4/finidepoguwomofiz.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/fipirud.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/9298099336.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/b19c0f1fd27caf39948958c965efb0e8/dabosesosojef.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_off000110f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F3 19668 bytes
SHA-256: 3bebd7dd1df3650d62d3c3eecac9f24ebe2f13d9b342632e43e0eafbd5c8af8f
font_01_sfnt_off000144ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC2 11120 bytes
SHA-256: a8e8554a3a569b717933ee2cd7f8877a693f10e5c956a3b5ea5a7cf6b45d29c5

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