Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdfc55fbe5ec7ba…

MALICIOUS

PDF

107.3 KB Created: 2021-08-25 04:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 99bedf47c79e8c0cb92e04a14afd3402 SHA-1: 114fc3bbd99e53e8d86d4f107f09c081f256dadc SHA-256: 7fdfc55fbe5ec7baa43aa4ff572d3ec11747e5121c4859128a0f73555e0f8a23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and leverage potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://crysiq.ru/uplcv?utm_term=black+tom+and+jerry PDF link annotation
    • https://amrapalispot.com/userfiles/file/92643474625.pdfIn PDF document text
    • http://topstec.com/d/files/zejamuzosowerofuk.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/37uf1sorbmq1m48kvb08jd8v01/1581361026.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/jetivoxesijapelo.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/wubowadulixosopuv.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5a82b53c051bfc66b300021a57369ff7/lijobufiwazata.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/79109275583.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1611d551c42329---36229142095.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/11310110479.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/jizoku.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16120ceafd11fa---lusisam.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/90411093383.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/bifubekefefofenak.pdfIn PDF document text
    • http://abwrva.com/uploads/files/17630355157.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7e9f610cd2b1aa364325b2fd05bc3dab/7724830814.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/19689575763.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160870d8fb43ab---3617227106.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/52611879269.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a56e11a27b---84898140787.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/15782254938.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/rujekepiguwunabanasuzusiz.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/q7jk8juqvivt7ar7utf9l515s0/zaxidudiduwozexozagikiz.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/63282785668.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_off00013d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4E 10660 bytes
SHA-256: 07810766ed1be8f5b02148ff38de8bd0637f65c10e08b4d781e2032e77ef3a00
font_01_sfnt_off000155d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DE6 19380 bytes
SHA-256: ecc8dcc6dc1ec23c9c28aaea5c977f773e0a2288a08d27a42d06636b719c44d5

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