Malicious PDF — malware analysis report

Static analysis result for SHA-256 59108b61ed308d85…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 06:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d65b42b7ce45140efd45be020fb81d0 SHA-1: 5b75c586c617c516e5f124c8789d9fc81d10bc5e SHA-256: 59108b61ed308d85c2cc7f6a59d96b7623308f6c2fbe7a332068f23ea086dbca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for further malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of link farms on compromised infrastructure is a common tactic for distributing malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7947ae6df---sadedozojijovekutez.pdf In PDF document text
    • http://kiuanai.com/userfiles/file/puxejevegogitegoviwawew.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/xizenogaxabawurinoxev.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/7f02a1d37c6077c20b079098c03e8fd5/sezodegemove.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/33751021204.pdfIn PDF document text
    • http://bronia.org/userfiles/file/70129811746.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf1ba6fa49---37735097011.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/f36d1bcce6e0930204591e81b4eb8085/milizesuvis.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/baxafirolemukebuneriw.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/7045373422.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/25068727072.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/12009228361.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a012c15f6ca---zaxujinemejijojidawimel.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc49924d55---powavurusev.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/vibekotatumesuriwakefox.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/57v1ndmtjgnggo1gnduj7i0kn1/43315431306.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a13a9e22---34752119871.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210518055005112.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cacb5d3dd8---zevatopuk.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/59fc36ccce1fb37106992e2409c89082/dizomefedomomanilokolotex.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/11095305282.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/31125102360.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/svoa0r3dnsqmh5g1l5ae9f0flo/48118569301.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/gemejege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=difference+between+equality+and+equity+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_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 17528 bytes
SHA-256: 8e9a3dfe7a8605380624d03f85136ec72ae2df002e218a40b62415030cb4032b
font_02_sfnt_off00012312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 10912 bytes
SHA-256: 05ff4755e8bda4e7d18d0ceeeb2145e979ccdaded44ece783bfd8b95dde6233d

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