Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf9e96f5e27b83e…

MALICIOUS

PDF

88.2 KB Created: 2021-09-09 19:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 667f6e1dd27bc460739a8a3c656f50bf SHA-1: 8a3cedd8486e2deb1a6600a581af70f0de7ca998 SHA-256: fbf9e96f5e27b83edfc1f9683ff0da965e11da7d4fd873772d1408c90a0d5659
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the detection names strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://crysiq.ru/uplcv?utm_term=track+steps+on+android PDF link annotation
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137eba5f1402---sotokutemij.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/dilepasupobemodebofipez.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/vodofulata.pdfIn PDF document text
    • http://calisnt.com/uploads/files/74504945819.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/rasomak.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/taxugawabowaxopetazale.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135a6b06fcaf---wevagejema.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/nazasubit.pdfIn PDF document text
    • http://youil.org/userData/board/file/titazobisidijemuj.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135954238370---xunepujijarodujisob.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/42039902011.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/mopixozivineweze.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/zaxagusur.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/40345015752.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161358162edee9---68488089348.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/provkspnprdcohe1n3ackn8mq1/loraz.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f76911b8980169c729d763b3147341d2/67496841146.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/66432609570.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/80960627022.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a4198556bf3558f0f1e7d439e868e24e/xuxibezidazor.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/waweb.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/77270399618.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/33407935265.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210901065606.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210903044355.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/bipitepuzuwadediwolej.pdfIn PDF document text
    • http://konberdbio.com/upload/files/77341288228.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_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 18844 bytes
SHA-256: c9892d12b69ea22fcdf6fa7089e2217647b9fb2fe782bb40a2e60359ade3dcbe
font_01_sfnt_off0001229f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB6 10516 bytes
SHA-256: e2c21a4cf9a7cbf62d1a5f921e37936d9c1b4b3f7ba2efc6d3b745f904246b3f

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