Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f857fe376bb2b7…

MALICIOUS

PDF

73.9 KB Created: 2021-09-23 12:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bf43eafb0c27d258019fa94952088c29 SHA-1: 5ca5c6c24e6b77e7eef74aa0627a4adea8e4a890 SHA-256: 82f857fe376bb2b734c2235503afbcb75c7876fc9b254c8133811f15f37c07f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://perfect-gallery.com/userfiles/file/53176252346.pdf In PDF document text
    • https://cargotavio.ru/files/file/monaravo.pdfIn PDF document text
    • https://anjingliar.com/contents/files/70301100004.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/31512716661.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd688c69a---47427223249.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210912122455.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/milavaxaxofidorelejet.pdfIn PDF document text
    • http://cloverdiamond.com/file/wamezijubani.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/46771060909.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/mivawotubexekogatoz.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/rutaruxiwe.pdfIn PDF document text
    • https://wittnebel.dk/file/sunoxom.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210907021926_1778459300.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109081429136011.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0dd51b013d1aa1f603c46c7e07836d83/zexofuge.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/latazi.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161354a8b3ebad---kofefibopizafija.pdfIn PDF document text
    • https://il-gusto.com/images/file/dunapezoxebidaxorax.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/rovinerezo.pdfIn PDF document text
    • https://kawanmto.org/contents/files/folubu.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/turadarovegi.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/zotebiropemifilemenemekil.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/71429391717.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139b59aabf84---99340991645.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/89765623184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=east+los+high+season+1+gomoviesPDF 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_off0000bed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED8 10556 bytes
SHA-256: d19b9682d997e8ea16672b4533b72effaf3f78830b6f5201d3b0ecc05a2d4376
font_01_sfnt_off0000d6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 16708 bytes
SHA-256: ec9cd5b799c187ed5c09ce324ef0be419cdbb0a0d4d9936188daaac7c74a703d
font_02_sfnt_off000101d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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