Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f087d9058f0f3d5…

MALICIOUS

PDF

85.7 KB Created: 2021-07-05 05:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b5f0499f9153fc933a3ad228a92b7ed1 SHA-1: 5e735ec4ef1ceaa83813ba39462d7008d9d0af46 SHA-256: 9f087d9058f0f3d5c8fd41c5480bc998e614f2a005e30d52072888fa648b5a42
96 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to external websites. Several of these links point to compromised WordPress upload directories, suggesting a tactic to obscure the true destination or leverage compromised infrastructure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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=extreme+kettlebell+cardio+workout+2 PDF link annotation
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/ebf00e77592e642f9ffcaca827d83274/jepesanupagadewujowuja.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721871c7a37---51690700215.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091e8527843c---jaxuxegivip.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c72dc6420c---96065077488.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/zizofirigovutukozuxodix.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/leguvagepumetemonosudates.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99a153db30---feruxuxibu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aad8b856585---zowipes.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a76bc71ece---bupafajezakun.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4bb98b311---85205012569.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/fizeromogavu.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/506818c831cb0539718c2d0b53f58a73/56922396654.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/8e9ce6124e80d844b2f71e68e6b194c4/sopuvomaxidojowepajugozuw.pdfIn PDF document text
    • https://pilisilovaskert.hu/ckfinder/userfiles/files/xoterawibexewiredetotefo.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608686db0fa3b---1670458291.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/15823771619.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/ferexufovol.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1b5032055---felagabu.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/pumakuf.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/7e0d321cda9e6c57c5c67198e6dc0056/55302754920.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/16313858768.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/39945557097.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/oj1439mhq4huhipab2g4kc5scd/bikevufijowasizufuliwopa.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/54334285980.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_off0000e9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 10880 bytes
SHA-256: 69b74473324c10cb7f7b2980777cc08926184dc22cd3c703f8a0806c3ea12825
font_01_sfnt_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 17420 bytes
SHA-256: 35b4f55e6492f0e80353e5e0e39cf2e9dabdea6b2851d4d6b14304b1e5bfb8c7
font_02_sfnt_off0001310a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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