Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdc641d8812a2eb…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 15:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7356581ff920d4ac688636ff8535b969 SHA-1: 6bab46a9078ab44ffe254776108ddcd04b63b15f SHA-256: ecdc641d8812a2ebd00d521d9db185345ddae0d6c57e4b8aefcd0327569df5f8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content. Although no scripts were explicitly extracted, the presence of embedded URLs and the callback lure heuristic indicate a phishing or social engineering attempt to trick the user into a harmful interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://gewald.ru/content/Files/jalaxogikuxanutajurinum.pdf In PDF document text
    • http://ch-yang.com/upload/files/zowuziwarolewufagurunowat.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45aded1b85---dazatubukasetorixudi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1d774a9719ed82ac68aacbe9d110b90a/zaxuvovivu.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087f25058fe1---wowesexos.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607804b7bcfad---24687010247.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/2746065483.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/49968258009.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/21147727913.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9db465974---xoterinopiwokokojo.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/90787652231.pdfIn PDF document text
    • https://rajaunited.com/contents//files/vibekorikupitura.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af94c44e902---15089608310.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/34489595867.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/th65eg0dq8sbv5olt10me91tq5/vikegukilodufada.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/48361001010.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de629ab9176---38028254564.pdfIn PDF document text
    • http://apple888.vn/luutru/files/67517010517.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/4f07a0ddacfdca0a1f2f0af1574bef24/kepefevupunudojidilopodi.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/18487671084.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e161d9108---95533854963.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021070118341391.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/57chgah6veavdq9glamiqa3kur/59012397102.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/sovuw.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/24367422432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=funciones+de+los+macronutrientes+en+las+plantas+pdfPDF 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_off0000be7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7F 10860 bytes
SHA-256: 16c046ada0f33d3184128feea23210ec8841194182e9f6e94ae2ed5ab280e3e0
font_01_sfnt_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 16024 bytes
SHA-256: 5c5d84d10c326df7e0e10630a465e4e856157ed495eb9d1ff8cc59534e2c861c
font_02_sfnt_off0000ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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