Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c17036df998e5c…

MALICIOUS

PDF

71.8 KB Created: 2021-09-08 03:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 283ec8a00d1370ced7e8eb60d8f75bb5 SHA-1: fef3f95971ba86bf62e0e76ab24c14281cfc2c74 SHA-256: f4c17036df998e5c043e5407036150fd5acbc0eae9a64ba238aa3f077bf905aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised WordPress sites used for hosting files, indicating a link farm designed to obscure the true destination. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff971311cd---jepokonidum.pdf In PDF document text
    • http://mingzhicc.com/userfiles/files/54823605663.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/95096554001.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///vikalimotumel.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/63715437775.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e522c4a680---rugonenupatufelule.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c924ba9ba3e---vifuzerufamurujowopapataj.pdfIn PDF document text
    • https://bangkoksolarpower.com/syner_upload/images/files/duvap.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/ritefiboxokewotudi.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/wulon.pdfIn PDF document text
    • http://thongthien.vn/upload/files/57025470736.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc65ccb3f5---kajege.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/1bb76f9b11b32181a59e52715f7a27a7/13361700731.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/12i75ennhgoq4tsmei5c1akmm2/nazate.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c8247fe67---38678477813.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/ligobarepoxibakil.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0bdcdf943---bikekaxogajuboxupivi.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/16899690859.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/didafagoxoma.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075ba97b1c71---vasewolar.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/bovarazemorozifere.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608108c121a46---31808887976.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/66582449924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=adding+and+subtracting+fractions+with+like+denominators+worksheets+common+corePDF 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_off0000b69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB0 15500 bytes
SHA-256: be61ba4c22cae373b09e3e493e0d7a0996ad318a40942d1ae6a6f6243b82aadc
font_02_sfnt_off0000f66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66B 11324 bytes
SHA-256: d9d3cb447652515c50ad3f1dde899192546b9bdc667e14aa1e1d1434519b93af

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