Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e5e06906dd46dc…

MALICIOUS

PDF

86.4 KB Created: 2021-08-05 09:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a82c585669abd06f722d468652b2554 SHA-1: bd09bbd26726141f46a448fe225ecba16f9b98f1 SHA-256: 21e5e06906dd46dc63a0b1e70e650b3ff7abc5388065e6a87efb5081cc36c556
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of external URLs and the nature of the hosting point to a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=dibujos+para+unir+con+numeros+para+ni%C3%B1os PDF link annotation
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ad78ca37e---pojenogatejapivowudivavot.pdfIn PDF document text
    • http://willbramephotography.com/11939933206.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/wabena.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0pv4em3bpktf9pu5v9djuscfvh/motokojiba.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/diranirejimuneto.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ccbb0c4fd---lopogusutebawivomejiw.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/nuboni.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb81c33770---wajurovanesebarumigulu.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/papafemafalalosekij.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608c924609f2c---tumanise.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160817e8c95735---zijaperujebenoxufunopa.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083b49bc2dda---20765712957.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4ac604726be613a1cc4ff91f97b97dbd/30272350080.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16081210c2ab88---niramemaze.pdfIn PDF document text
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/nexefuzowub.pdfIn PDF document text
    • http://tcihk.com/userfiles/misuzebevukezozeraguti.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/guweduxope.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/42431191771.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/6361516871.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/sisefetiwop.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846cd383d45---liwazofadarajijexupuviw.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab102b191c295091ddd13937330373e4/90616826082.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/94857294069.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/61901591638.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_off0000ea84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001029b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 10968 bytes
SHA-256: ba8af801a4cdb0368e3733e8d2796481d59973b6e25b24849f9af0fb03a40ce9
font_02_sfnt_off00011b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B81 17592 bytes
SHA-256: dcfd57262a37dec5f7aa139c06e1493b3cd0f8ab865f8a3f8d5883d44ff0a6f5

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