Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d914f626df7bf9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 22:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03fe9b42824ad0d560927fe8a78edbe6 SHA-1: 342a20c37ff4e4b7a68a9adc7d7086da691fa3d3 SHA-256: 67d914f626df7bf9d0f3f5e0c113afd9714e4e615cb39f4c1e350dc064a7b8bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to lure victims. The presence of external URIs and the nature of the URLs indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=tsunami+de+indonesia+2004+pdf PDF link annotation
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/78445175873.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/nofamazevamizoxiximutu.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/sisirirow.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/36525578960.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/57224901267.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/siwefivo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161047759ddfd9---59567008086.pdfIn PDF document text
    • http://bichvan.vn/upload/files/33198992421.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/9451408826.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a072a8e96c---tapadobixawimusuxapu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8cd78ce9550edf93413389f825d649fe/60262210087.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/17652607826.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/duoo76ducduqh2qchukm4ml201/wifeduja.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/wibaliga.pdfIn PDF document text
    • http://tulga.ru/editor/files/47440073367.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608b82723266e---wakixowunowebemekedunetev.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5ab7ede94---lanagod.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/ecb06bbcca85f615144ff05f69e7b5c3/90064488986.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/36239128883.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/87805915187.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/82110147414.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/savefuzuniboga.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_off0000d774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD774 19132 bytes
SHA-256: 0e132f654e35b5ff0ddc9e5789d9f413933a3d669f53e6bbf0fb5cb5c83b1c13
font_01_sfnt_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E0 10796 bytes
SHA-256: 9185e1a1a2d9d5dcd3f95b0d3fd0fe40953c06f0853973b5db95fea62a7fe459

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