Malicious PDF — malware analysis report

Static analysis result for SHA-256 9484815d4ef7430a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 19:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99c71f00592a48eafa5bfdddfc3bddd4 SHA-1: bfd89d39ebfd2530f00411edab28eba1ede03797 SHA-256: 9484815d4ef7430a7889ff22671c26b183e4955ef7e72b8dfb339e715bbb5a3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The heuristic firings indicate this is a link farm designed to redirect users to potentially malicious content, as suggested by the ClamAV detection of 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://inwebjor.ru/uplcv?utm_term=how+to+fight+a+dragon%27s+fury+pdf+free+download PDF link annotation
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132707e7fceb---98904307965.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/pajuteweriloxudo.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6a2a722ce5f63ae0e6ee75801034f5e2/36163068984.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/tasuv.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/ninefazomaveb.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/22294916952.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/4957152923.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/63769040849.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/95464510160.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///3952531704.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/jojaja.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109011804596454.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/98152574072.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/zimeteduvosonirajopezo.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/94284803548.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210905024523.pdfIn PDF document text
    • https://jin-ji.com/upload/files/ruzedijoregova.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139be1880ece---2896724549.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/44171907033.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/tekagurowufamug.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/89665041098.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wufir.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/10413734363.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/58867028040.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_off0000d606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 17788 bytes
SHA-256: 81d458c13445207cafaf17ba839497b7c1baa41b25b45e9d318522b89dde17ab
font_01_sfnt_off000104cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 11100 bytes
SHA-256: 37a85bbc3b0bd3acdb9b3dbf828e087992c428fe9e1e6929e519df569c05851e
font_02_sfnt_off00011e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1