Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4b28384bc72df6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 10:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5960986daa81c59d3d85ce7350d7c844 SHA-1: 16ca9504dd2198afd2d6932a825ca19eac08c2db SHA-256: 1c4b28384bc72df67bd7c9554b09830b6f2a79a82f2199ca03720781e3f35599
184 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised websites and potentially disposable hosting, with one URL explicitly pointing to a malicious PDF upload. The presence of a download button lure and callback phishing indicators further supports a deceptive intent to trick the user into downloading or interacting with malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.scmsgroup.org/ckfinder/userfiles/files/kinegaze.pdf In PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/julurawupugimagixibisa.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/48663605057.pdfIn PDF document text
    • http://kleiberit.ru/files/file/31551223494.pdfIn PDF document text
    • http://candientushinko.com/images/file/zebotaxewonilukekan.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378a8baa4ed---589857719.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/161523548979.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/vofazevagukigetelesi.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/44736345364.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/13677799742.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135a676b1227---muropunazugelu.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210905204250.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/foxurulizof.pdfIn PDF document text
    • http://chieucoingason.vn/files/dujabujubozumuvojasasiko.pdfIn PDF document text
    • http://3sdent.com/upload/files/72806280186.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/75776536854.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/89131111450.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/54698350586.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/gavuvigewabesagezen.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6ca5fec7---71719133673.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/66030135039.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/geguloz.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/55376063594.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/4718736198.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/povozirokuxokaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=install+google+search+bar+androidPDF link annotation
    • 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_off0000dcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 10740 bytes
SHA-256: 8b79b0f6cb52a96119c4bcb121550659b41fe6b27bc10d01677fc9589242e229
font_02_sfnt_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 18272 bytes
SHA-256: b6f4b2717cfeceaa7925a16aaafc5436aaecce25f42e03edbf0900ea0d250526

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