Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcaec0e56b5ab3b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 09:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7557709e85cefc0910cbd03b6d7f205 SHA-1: 6d49bcbea14a83edf1410f77d4da2a53ab823914 SHA-256: 5fcaec0e56b5ab3b52aa10a70e621dfe43d1948b2864e930e1c590b51d00583c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate effort to create a deceptive web presence, likely for phishing or malware distribution. No scripts were extracted, but the overall structure points to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=children%27s+bumble+bee+song PDF link annotation
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd12aa4b7f---61195415955.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/14626619361.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/85797659714.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/88882881133.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/78191314418.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/demoporaletedojizoke.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/12773906633.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/89432292162.pdfIn PDF document text
    • http://floramarble.com/uploads/4285409954.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/guxivapanovokapubowar.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/7762106545.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/jotogogazuja.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/larojufupakazino.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/rubegiwidowiladedovizevu.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/64275384464.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xorogekagakefakemirax.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090206560134.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/5469037051.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/88399868348.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf82254ac3---96046498984.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/bavuwurodorigixefozixa.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/volowujezumagedurob.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/71799377406.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jtt4epbdnlvsha57bft3is7uas/kanojino.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/72600023100.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/16753892406.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_off0000e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 17624 bytes
SHA-256: 0d7671a90512e4e215c6580036eea1a41091f41ce54780538bdbe18581b1a659
font_01_sfnt_off00010e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 10740 bytes
SHA-256: 2ad008cab2d3b0fbc63758b0960e9ae10f318790af0460cc6da9a7c452f74e59
font_02_sfnt_off00012694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1