Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef6dd7a9f337d1c…

MALICIOUS

PDF

103.0 KB Created: 2021-07-05 13:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3afccd7370d3ac62599f8c0a2826b81b SHA-1: 8798fa72afdaa1abbf1b18580343e035a2790140 SHA-256: bef6dd7a9f337d1c4890008c4d4ad2441c388dbb5e2b0e2e82d4cc20c5d8cc41
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the detection of a link farm on disposable hosting indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/g9gthi0ndbejtib1hjs6ul5t3a/kewanakorupipobemazus.pdf In PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/zibiz.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/7f652937ad5bc2d502fa68204c9e449d/72360928351.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/46323043145.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8d45376b3c912ea4a6e2afd3a6b33968/regimugegibakowigiwana.pdfIn PDF document text
    • http://computerdoki.hu/user/file/xijarobuvomesefene.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed79d467e5---gelufelap.pdfIn PDF document text
    • https://aspirans.com/files/file/26402643348.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae8b5e25b3---lukarinebalajun.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfff6f75898---63621976343.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/aceb3ko3c4rqkjfh7riq476cb2/59158459299.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/bikiv.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/5a8a15eb69ae98cf8ee5f78d656d6b8a/43904988537.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af2de75992---bipovanudiza.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/5tblh6srrcel9ie6i8bidu2rea/70516550882.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/64757842126.pdfIn PDF document text
    • https://webmenuplus.com/images/file/niwal.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/b888f3d763646998633ab5249f62ffb4/walizis.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b37d04b1f2d---14112925568.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/sebajel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a5dde0fd---nojezefijorogebe.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/74309991327.pdfIn PDF document text
    • http://polkovnik.su/upload/file/zudewuzuligotusetifidax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+meaning+of+manePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ec4b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEC4B 28032 bytes
SHA-256: 34849dba6fe71e9e952a6c1a70853af9340fe17a9b926d3d7559ac41d0f8cd9d
font_01_sfnt_off00011ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED5 10212 bytes
SHA-256: b1b99b84b2f49133c5fa617aae119879503912529421bb69cb4c88aac807fd8b
font_02_sfnt_off00013584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D91 2688 bytes
SHA-256: 9112d4ac07bbf7fbb6b40d30dcf4a4f18a5b944f03db4531aa7fa7f65ac663a0
font_04_sfnt_off000158ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158FF 21472 bytes
SHA-256: be05e273e724631a2ed6a062520cb3f74c0c172d31924114a5b459d0a1b5043c

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