Malicious PDF — malware analysis report

Static analysis result for SHA-256 e389db20de7d1d3c…

MALICIOUS

PDF

79.7 KB Created: 2021-08-04 06:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b02fa96b8b5aae15d59be6c78734281 SHA-1: dba0fb9ad72c7ad6ba5c88299fc09717999b81d0 SHA-256: e389db20de7d1d3c54d2435b1a0a6d2e4051eed7c53daba71680a2d2677b1418
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to external websites. Several of these URLs are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute phishing content or malware. No scripts were extracted from this sample, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=mecanica+para+ingenieros+hibbeler+solucionario PDF link annotation
    • https://systematix.pl/userfiles/file/18169679867.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92b0da108---39561433816.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/90959262330.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e80fcf38c0---15297684359.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ca287eb9f64cd035a7726f9a05d292e0/kibasuxujakuki.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/92084264412.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/76801947730.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210625135137614.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/kumumababonugobelupuren.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/95528127914.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/93440731441.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d5f2fc9684ea7cc5da49c1afad74b41a/93344706040.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0757bdf00f81c15b6cf01dbf0ec586bf/23009674019.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/99720074699.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/zupekeg.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/f22eda6320032ce41391b00ec1d4be9f/86507772247.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/kapumavazeno.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/9808570117.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/75267783026.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/8aa5f4922b7265b26892595e981454e8/98688913831.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6d5254ccb---wiliselakojerode.pdfIn PDF document text
    • https://mnlex.it/file/66999296774.pdfIn PDF document text
    • https://rcot.org/userfiles/file/36159816204.pdfIn PDF document text
    • https://netpage.info/userfiles/file/sudenojidasizatapodekaka.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_off0000d3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 17520 bytes
SHA-256: f92f17b03a97ada136069c5b41cae63c5b5d42aed491ee6af8d790e224f8fac4
font_02_sfnt_off00011849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11849 10788 bytes
SHA-256: be3fb6c7d6d0cc4706e1d9efaf7b89908f0423b82f871152045eda4333914c4f

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