Malicious PDF — malware analysis report

Static analysis result for SHA-256 f952a13459d2bf85…

MALICIOUS

PDF

91.3 KB Created: 2021-07-07 20:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ac1a574e5a46c921e18afeb16663826e SHA-1: 0e215f4e27686df292408ae79e4eee51f1351250 SHA-256: f952a13459d2bf85640292273eef622e48fdd2fccce65770bb9202d1bc79f8ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely lead to further malicious content or phishing pages, suggesting an attempt to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=the+perfect+wedding PDF link annotation
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a8c49bf56---pawipipebomebuvik.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/d0fa3e758b18c7b80fa238384b73a8be/65809294661.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8635058668---jikesazimigesujoxepudifak.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/5755128218.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202177115726053.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/lfg2aahgmql98r8d5o6hmg1uk7/perofaximuturababi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ebfvt0niacb65rpig59vfjgiq1/nifefuzisokikopo.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/41208020788.pdfIn PDF document text
    • http://bluenanum.com/ckupload/files/92060887091.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f8afef8f3fd7b61ae14200a9b4573990/41743573758.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/gikubogekupaxipadivam.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f00027ed---lurorowugexurud.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4943565903---8562702683.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/puzibevadizatixadejop.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/lalewubo.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/vugusegoden.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/49054649973.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b3551b045---35818666260.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b0be031642c136be3ea2d6679bd1d1b9/82188967810.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/66dffb565502e82a0b3769fbbc158111/ramanalisajapenogeku.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/29455149187.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d663635297d06841273b08a512e3f553/suxuwemiron.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/junokeno.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_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 17164 bytes
SHA-256: 0bf6c3b76051d7e7e60e7eac523ce17c500ddacdc7f03d9499e571087e3de941
font_01_sfnt_off0001308a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A1 10452 bytes
SHA-256: dda8eb61f8fcb72b54f4dcf13c96495aafd596bc3b5fd541357d84e14bb9b29a

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