Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad7a43125897a2d…

MALICIOUS

PDF

122.9 KB Created: 2021-09-20 12:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 60a010677d137356e5a1f4346f25070d SHA-1: 4d190ca5b97439fcaee2ec8609d4d0249351828a SHA-256: 8ad7a43125897a2dd0e37953c63ee74398f18c6e6f5fe695bc003c4a5701ac0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a link farm, with numerous URLs pointing to external sites. Embedded JavaScript was also detected, suggesting potential malicious scripting activity. The presence of these elements indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=farming+simulator+14+hack+mod PDF link annotation
    • http://eschool365.in/js/admin/uploadfiles/file/bewuvigubavixaresubapefi.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/manorasekuruwu.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131838e50b25---jopepanawejotavobemiwom.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/66963576848.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/71083646947.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/6910828967.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/95011149885.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/14969fe36b89c82d231fb3cfdb8ac5e0/geviriwiketozepefapuj.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210920153520.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/24899678075.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/98998557324.pdfIn PDF document text
    • http://www.polni.si/Images/files/69873525630.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/84566130794.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/61804940739.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/7729e3ff473d1bad6e376337002b1389/78641826581.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/89669641143.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/47956166105.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/rapob.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109130543366856.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/dazitoroto.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/69252586075.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_off00017345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17345 22052 bytes
SHA-256: 5576f9a3ca4e72bc890a0e7428f14f5cd0d3f33fed186bbf218ec06bc08e2fcb
font_01_sfnt_off0001ad01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C518 10984 bytes
SHA-256: 7e9f8ec48fac2cb9c13d0e55b65e674156371da58eae9745b527958a148cf511