Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7659180ab8507ec…

MALICIOUS

PDF

78.3 KB Created: 2021-09-07 01:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f685b195e0baec17be6432f8b1a866d2 SHA-1: c3bff838eb9f2eb4b7e22d0bf833bca7b9bcacd0 SHA-256: d7659180ab8507ec8065aec8dec7a398ab505f70848868795a6e012253b9789f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be redirecting users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://robodom.si/files_vsebine/29073914715.pdf In PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc87a0a62---fetigawem.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160705a0430946---97456714234.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/64336109623.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/44887294147.pdfIn PDF document text
    • https://windsbs.biz/files/file/75725798792.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/21276697512.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/ladikitomapogodorawonu.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/41324688068.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e28f23997---gitusowi.pdfIn PDF document text
    • http://elma1.ru/!upload/files/95423530284.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607067cbe847d---41658757388.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/malesulerejemobe.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/cb21517ad98d401e6164f5a84fb40477/62092049129.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/2642a6290021453bf63c9d9855b61602/11873193160.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/fbc72d4caa4d578c6c87f3aa23c5d54d/64723305287.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2197a4e85---92843549692.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/08/12/bexadidenodoso.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/1gd3r5drep5gont2qveupeqca2/faxalumuborigife.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/v7cn616h5vaib4mf2egr3cf3je/90181589385.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e643968db---jomufuduxigubesiveximesa.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/24164069196.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ab752cb69d388c934f60605d94e45595/52600271271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=psr+s775+owner%27s+manualPDF 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_off0000c3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B8 21240 bytes
SHA-256: 2ac73fa84704b600c940ec33e80dfc71c9397faa46ae0932376dd7935b8a249c
font_01_sfnt_off0000fb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11380 10484 bytes
SHA-256: 1f29ea4b29c46e515aafab66e1b4c178dace239cdcfb68ef75b90fe884a71ddd

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