Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b926bfd3e19f3f3…

MALICIOUS

PDF

95.7 KB Created: 2021-07-08 06:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6746445cde6f0a440cc333f799d57a72 SHA-1: 392a8287034a7d7650a8825c85d8f2bbc83f4fa1 SHA-256: 9b926bfd3e19f3f381497281f3037c95cb0d9af0ab76f46327357ecb4957f46c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://crewmak.ru/uplcv?utm_term=technical+accounting+questions+and+answers+for+interview PDF link annotation
    • http://ahsaipu.com/v15/Upload/file/202155142032636.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/funibexazuletijorol.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/32237210854.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/nujoxab.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/fogunawowen.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/d0o6vg79afepu17gcvamk1nqej/xotogeki.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e49d2d293---zakima.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b38d37b94a1---58409309137.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779e5d35996---zaxajatagorasujatukize.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/nowunofoma.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/d3j9st1i2dnhh233iqnevb6651/95265387389.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe4cc9faf---wulufaxo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090059d265b3---65099523654.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcfdf78f5f---10085100888.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f8ffcb2cc---38029729987.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c285acc0ab---70054943728.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/juzabatopalebojevof.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/rofewosikotegunififemeb.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097d4b8d0ddc---gujagabudukum.pdfIn PDF document text
    • http://sooclose.eu/upload/File/gubavoxijovas.pdfIn PDF document text
    • https://actor-conseil.com/files/file/15658783641.pdfIn PDF document text
    • https://retta-bg.com/userfiles/23422811161.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cfa133313e38b9dc9a3e11b9ffbe994d/2760069453.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/80dd632c20062dd3ceec37254edffc11/97073333978.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160858610662bd---42502091839.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_off00011115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11115 11116 bytes
SHA-256: 908d423b6435ee58292488c29ab2bbfbdf188f7fc313e9cf7883930ff6303d78
font_01_sfnt_off00012a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A87 17636 bytes
SHA-256: 9f3b97d57ec8021b17b6e0ebf46f4e55a005e8e04573a056774093e2f371ce0f
font_02_sfnt_off000158f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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