Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b704b65e71b24a…

MALICIOUS

PDF

95.8 KB Created: 2021-08-06 22:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 04cf4dba9e2ef7180f254bc63a18f55d SHA-1: 26c2a1d6c12add0a9ed1393f5642c632c5953751 SHA-256: c2b704b65e71b24a966c1723791f5133d990f7f989ed2a675a4ec4deca441229
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users or manipulate search engine results. While no scripts were explicitly extracted, the nature of the URLs and the overall detection suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=qualification+of+capsule+filling+machine+pdf PDF link annotation
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16088a9d2185c6---lizadigololawepotalugibob.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9043b75a1---21806901304.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/67156679492.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f9a7abc95---vuxemewasifuziwe.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c8942evbg40n53fg6qq78aqc81/81841704685.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0f013c4552202344028d34af709042d1/nofesapoxajotekutilat.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/257409a30f1d1eb82ead17cc19c33d8e/fusopepawososolavodawo.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/97684666358.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbee3443608---37130454107.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/dofufilemesimiwofowo.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871833049ed---fuzitoroxekurejagosuv.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/cb9699fdd60dcb7f9485a4e5ecd84e7a/lexulowo.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/9046394086.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073ec4e31444---71629596183.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/46818189158.pdfIn PDF document text
    • https://xistenze.com/files/files/61944245056.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/vkopdmj39fbriv6j25q7pnbgp0/57823371678.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/97287884759.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a3ff31e91---51531752159.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/jowanapokinagejoguvomapum.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/a95a7841a098e4bb4926673b8677a768/8694566961.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/14703927664.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b68f887b6---sabuwozapesejovamiwufix.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/gisudunemavenoza.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_off00010a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12216 19612 bytes
SHA-256: 51f5a64d8a8a6f767c36a689a6be8e487ebf07fc7f6340d9e02fd1428a0dc8b0
font_02_sfnt_off00015465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15465 11124 bytes
SHA-256: 67c7ef954b806a5a16ceaa0fd989c9cbf2dc48cfcba5ef5cc4d83109d0f49366

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