Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c045009b7b2660…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 03:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d878e669f26de438c4828de09d1a643f SHA-1: 03469b3a5635782a4892b790c549acfa55c0c676 SHA-256: 83c045009b7b2660bb35c7cb4a72bb5a2aa26744cafe8e681f8e267809de3de7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the nature of the link farm suggests the PDF is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://geoodwierty.pl/files/file/65277202099.pdf In PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/96202423188.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/85775111341.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9e07f6d6---26619719173.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/48157337763.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613661be0beb2---42208754144.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/563b1cda47f988754da9cc3a4f2c6461/nakafon.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/moxunodavibebinebatotas.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/71296843485.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/31935475298.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/51800964129.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/976032595.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/kupemawomojokam.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/13439638251.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/vivekukigasutidetoriz.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/gowuwa.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210905025724_r3wos7.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e84d7a92e---28005769804.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137b5a1f2a7a---kusolikegufokasedawezi.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/63814103299.pdfIn PDF document text
    • https://aitalk.vn/upload/files/tawasipogeduxozi.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/wofexinalujekumitewugedan.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/78685789204.pdfIn PDF document text
    • http://furniture83.com/upload/files/kazenomekuvodal.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/nisodizosutel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=grand+city+thug+crime+gangsterPDF 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_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 17868 bytes
SHA-256: 1d5d826400cf0694e12c5a7ef3b85c45d5f5155dfbefb603bd197cd62e84fbba
font_01_sfnt_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 10904 bytes
SHA-256: 10e3587a26b8b1947b4834c19f6a44528fa8bd546bca22a1a9f7f87a824333ca
font_02_sfnt_off00012286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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