Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e9efa6a28647b4…

MALICIOUS

PDF

85.4 KB Created: 2021-09-23 19:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a366a815741470c758c049bdcd7e0d8 SHA-1: 3e91090f410f42eeea50fb011b776db7c1df5fe8 SHA-256: c9e9efa6a28647b4dd08c8fabf8f9f1c41714a19ff11279008025a1e78664eed
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a callback lure heuristic further indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=melonds+emulator+android PDF link annotation
    • http://bouwbedrijfansing.nl/userfiles/file/45579417385.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/22276086613.pdfIn PDF document text
    • https://showerdrainplus.com/uploads/files/202109201443277243.pdfIn PDF document text
    • http://polkovnik.su/upload/file/jemonilejokofijigipitax.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba20dd85a---44314418737.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d4779f7d84494563d0cd5e50a011e445/24515729603.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/38923362467.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/gilabavedutebad.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/94719078412.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/xided.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091815285456.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161338ae492fb8---70173984124.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/43071521105.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/29763257950.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/bigatu.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/bofovikiruva.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/miniw.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/fufawevunajilubix.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613763667c383---zijefuselidusokuroxoniru.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b1a2700951566ccc56135df2b039ba4a/xemaripemunemo.pdfIn PDF document text
    • https://wecareprogram.org/images/file/jabegigukelezowa.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210918_171329.pdfPDF link annotation
    • http://autostyle-japan.com/js/upload/files/77271091527.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/686492099.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/70109879629.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/jeromegifilusek.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/54200650423.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_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 17944 bytes
SHA-256: e23e3155f9e8ba88d5fb537e2130231ba2cd0c8835ca9f1f01cfc3aafde658c0
font_02_sfnt_off00012ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF9 10500 bytes
SHA-256: c2ca52ffa4c77e475f61f897fbcaa9230a3fcd38b56f6c7e536bbb975cf67740

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