Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca97c45f3103b8a…

MALICIOUS

PDF

87.2 KB Created: 2021-08-22 03:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a5724f2594958c913557b6c4a0e2ad9 SHA-1: 8070b2bf6982ba4bb17a6b3dfb6b46c2e3e44643 SHA-256: 7ca97c45f3103b8a777d5f2b08edc2b6aa93f8792b1fc9ef6c5fa6ca210b629d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://bodzlomu.com/userfiles/file/52042149479.pdf In PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/tasadisopavovalurajek.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16098762745ba2---vumifelipu.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/89253350507.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a0e62a3bcce8b0c42e88fbc23c304681/71435029312.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/47103006658.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/ce73bca0858eded541356eeb05a5f1fb/dasurawevaweromomifi.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a7baaf2c0---82029359873.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/bexekadol.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/75120263453.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/96d5c1e0cfd3e3d3736dbbbcf4b18f0e/56608774092.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/vekovop.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/e3546d46f6fe337f644dcf908a39ef52/62564833667.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/22887724343.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/pagenatetugagujejak.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/wuxedejave.pdfIn PDF document text
    • http://ozari-ua.com/files/file/mawaberevasupixelew.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/6336940034.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/mikux.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/31817437054.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/65186741470.pdfIn PDF document text
    • http://mytaylormadefamilyusa.com/clients/864113/File/33504859456.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/tetomupugadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+write+two+and+eighty+three+hundredths+as+a+decimalPDF 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_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 16628 bytes
SHA-256: 416853ed7025e596b33f863baa327b444c2c67f8d807be352e1ea709c5bf4f82
font_01_sfnt_off00011a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A3 11108 bytes
SHA-256: 799ffd432e063fd83d9716c4e7eb824bd7501ca96c7dc41e0ff6beceeb986523

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