Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b504bb28a3fb20…

MALICIOUS

PDF

79.6 KB Created: 2021-09-02 19:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dfc1c7c28b4a92047f22789410161217 SHA-1: a2829e8daa35e116f954ddcb6732f88d99d287df SHA-256: 63b504bb28a3fb205001a876a6cc52e6c8d5ae10b16893c6709536e458a2a51c
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to various websites, many of which appear to be compromised CMS installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=manually+change+wordpress+theme PDF link annotation
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/851e14812971ab44d74e955e390f7fbf/xepeloxemunezi.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/1520d06a48f11112df7e8aa1cc11a329/85914896042.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d368814498---87434736934.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/xijame.pdfIn PDF document text
    • http://goref.ru/files/file/rugovudapajutiva.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/trf7ve64jabmlhq6lnnskbuqkt/dewonekiguvufigawudukeg.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/77868619412.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2dd7ee382---64368950591.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab56789a5e7---desugukusixufifarokiv.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/pujigonafiriluforit.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021052109111766304.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-28/20210628090159533131.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/zukikimosipitufujuxumo.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/40194553021.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d380b1bcd---wonixinaviwoweju.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e55a0a041b2---fopofaminodim.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/53aea1ce0d83f90d7bcdcaeb590d62f3/lerojazik.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/8dc84a418eeff99ea44d40539a411b5d/17519750047.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b7d9399a0---90324106465.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/108883162.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/565aa787bcba32f999a311688f6bc342/toxuvono.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6843ee7187---famutanapadularesokos.pdfIn PDF document text
    • http://sivam.pl/files/file/soragevok.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/14790040313.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_off0000d3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A6 16644 bytes
SHA-256: e16828bfac79a9f4cdeccdbdbab64a4afaa2580fbfbeabdaaf97733d5b1f4ade
font_01_sfnt_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 11164 bytes
SHA-256: 86f191a8b0831bed4d9b3ffd260eeb0888fa4e9b1add6be155706182efb0c6cb
font_02_sfnt_off000118af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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