Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fff4735764e866…

MALICIOUS

PDF

87.4 KB Created: 2021-09-06 09:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f52f058de54d7c0eb0c2c2fb5bd705c1 SHA-1: 59873c06bb60f01661360f857907b0ba21341cac SHA-256: 10fff4735764e866e1b172b4719d19c46cb51a7b2a99bdd7236eabbd8cbbe6c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to potentially compromised WordPress sites and other domains, suggesting it's designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://advik.net/userfiles/file/jemixofupidemu.pdf In PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16076fc6a346ea---38536249038.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606efddb5ac76---71267450440.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/duken.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/718e5ef5f538e44f1a79ff736ada6272/xijixifulitimemezomaja.pdfIn PDF document text
    • http://atek-ent.com/upload/file/belidadopomelefivosesonof.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16070a3e18ebe2---jedadanererani.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804ae063233---temuvapumevefifa.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160766d17432a8---jedebozapomeva.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/22253477292.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/80897686298.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/813431169155bd0a6b6a2c74e2626bd7/94549169749.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/dabed306f7e3ec57c4ff4955e301dc70/bamemojolakemeda.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/kelupujemetarunipabazutu.pdfIn PDF document text
    • http://hasyo.net/files/file/zuluvupab.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/22349545869.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/wexaxekomuli.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/966bf44f3fbf028ce10eb2db651c89a5/28295961612.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/gofevir.pdfIn PDF document text
    • https://theurbanthinktank.com/files/zobineruwodozubeb.pdfIn PDF document text
    • http://championsview.net/userimages/dimefevizowedoxokizid.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51fb3a4f9d---33749703111.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/7371641594.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608609714da89---wafejatijimigejumuzimuwuz.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/80210082914.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53fb2315b7---jegoxitinoviridunuzoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=diclofenac+transdermal+patch+pdfPDF 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_off0000ebf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 19784 bytes
SHA-256: 8d30474299f1232d4f01ce062d5bf2f9ddf1018f61cb73237e17b42aca08c96c
font_02_sfnt_off0001367b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367B 10888 bytes
SHA-256: a6614e77d4aa5979ea0a4eebe5e69467f25005a0310da13c121da1b10d6b6741

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