Malicious PDF — malware analysis report

Static analysis result for SHA-256 f872b84001f2b491…

MALICIOUS

PDF

75.9 KB Created: 2021-09-02 20:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0aba685628fa82bbff5e74d56486f5bf SHA-1: 9feab551b8501fa4c5506a1217239d643d42774a SHA-256: f872b84001f2b49190cf722060185cd6ecf39a66a64a77749927f19ce4bda390
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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=convert+pdf+file+to+jpg+high+resolution+online PDF link annotation
    • http://stainless-faucet.com/uploads/htmlupload/files/zifovus.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/vusamibidiragugaxofe.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/moweterusumimufapazubanar.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607207ed8dc15---14981812208.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/oq9lkn25u62ulopslma5mprper/muwijepalam.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f0215cae8---47639357395.pdfIn PDF document text
    • https://autopratichesas.it/file/48065492873.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/vubafoguraza.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/52283606201.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/a50dfetntkqbiqksbdbbsko24o/pejorurupado.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/xujepowopelixubotejulot.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/9lt9r3a0gk8aijq9fdof19och3/46085593845.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/e7t5cjhdpdg2srnh9r3r654or1/sutesuwenegabaz.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/sugibepu.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/36480527532.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160f23edaa9a0c---poponoxesisikorobil.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/kuzapufetonopozu.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072847d62282---luwadawoxiza.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/narofo.pdfIn PDF document text
    • http://merwepizza.com/upload/file/susimodobokevuvulonazudel.pdfIn PDF document text
    • http://portableandcool.com/files/files/jesejiwasalatiwapowut.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/wiwurozosed.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///98452706595.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/40767233510.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160fd3cec2c66c---kobofarojan.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/dekixavewu.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_off0000c518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC518 10940 bytes
SHA-256: 7224dd4a3b896b3c614387105760de365490e1028ffcb8a3300ce3403274a4b6
font_01_sfnt_off0000de2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 16852 bytes
SHA-256: af3f0ea302abc8f2d8b2e781cd1ba6acb1fd3432878505c5aa1608bdb5e9f01d

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