Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f05e928d46f46c…

MALICIOUS

PDF

109.5 KB Created: 2021-06-26 10:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 905726da1444c2d6586b92aaf12c6056 SHA-1: 533783de05dbfdb18e0b1c5127721d5f6134f64a SHA-256: 63f05e928d46f46c0e97a4def5e94cb3e3cbdbd05fd58d2fd5d1050270b5a91b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this as malicious, specifically as a phishing trojan. The presence of multiple external URIs and compromised upload links suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

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 http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077faf21b557---32610886332.pdf In PDF document text
    • http://cuatro-pr.org/sites/default/files/file/53915480473.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160875344b1c06---29408107473.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bffa1fa8fa6---75551627758.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092635e52e7c---78325519183.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/29962686902.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1209188b63a82e4925139a6e7f51970/43232079472.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724f23716ab---72159814371.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/potenipojetusit.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/ruvuveriw.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/40958703859.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/0kgptue11tdi47kk4f9da3omgp/90299441115.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/cb4981ed7eb019aab1673dd33062139a/wixupavejuwigej.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/5a9f498883ae15795ba4b0cf0939f45c/rufetugakitobavebuvijim.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/950e51a908d9edd4bf8c8c49ec6616f6/46647196740.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/41984781128.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/101896f8c7eb138481dd0b25cf80b20e/71533825000.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/mepewatezev.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tsq6sck00acgom52vv43s39abi/94827571874.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160798d3d5028b---82270248437.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/54068048388.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a383d4ebcb4---gategivemegi.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/vizibepebekodafik.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874c1026bdf---14100378807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=scouts+honour+meaningPDF 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_004_off00014576.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14576 26928 bytes
SHA-256: 3e2e1ad57cf42bf1839d4cd2553359903bd3bc5fbade387b165386d8b33613d3
font_00_sfnt_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 4592 bytes
SHA-256: c14fef4b278053e03d1ad292516f5939dfdbf7616fcc897ae6be70d6f78dcced
font_01_sfnt_off000104a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 28220 bytes
SHA-256: 6657c8ba97a33b1bf52b3a12553ee0549fa4e62c7c18e3143cae93c898c21872
font_03_sfnt_off0001754d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1754D 10808 bytes
SHA-256: 889f6b9c4de208ec56d5a3336b774ab9433f3e920a0c94451e15c6b19934efbe
font_04_sfnt_off00018e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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