Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b8fbf4af061b51…

MALICIOUS

PDF

72.6 KB Created: 2021-09-03 09:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37e3783e6ab920eae7138a5245202bd5 SHA-1: b121a28f9e6357a62f5c5171fd227fe61f746255 SHA-256: b3b8fbf4af061b51304fd6a5e22efd49424f8cbaa5b02f1e98c3e9bbf25ead5c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The presence of these links suggests an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://casier-a-bouteilles.fr/file/zisomulita.pdf In PDF document text
    • https://pointvirgule.ca/upload/editor/file/rikijenuwatupodaraxamet.pdfIn PDF document text
    • https://bauarch.bg/files/roteki.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/d45cd3af9c8e8eb3c98d70388cf30d18/davomebimaraz.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/24078432724.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/15123868487.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/9283636027.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/84335928656.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/96869105654.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adc93a28ed0---bokirutuzamim.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b58653da8f---79938607649.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/jepetarij.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/42694492813.pdfIn PDF document text
    • https://limsurdua.com/contents//files/riwogigegi.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/b53f285a10cc1baca493653fc8c8513d/gizezekujax.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/ginoxoxudagidatelido.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd0cdf0282---94928010204.pdfIn PDF document text
    • https://chptravel.ir/data/file/94012578522.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160732f0dada3b---53461145281.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e8ad712b7fc09e71b5c4b30427d2ff25/90223151117.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f4980bf6e---mupisinol.pdfIn PDF document text
    • https://aneri12.eu/res/file/dotudafex.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d3de026ee---punuzerabasenimore.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/segebunowuvovanunononiwe.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/27ce2f3885ede07781ef75c971db38c9/zufaroturo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ranciere+mallarme+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_off0000bc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC69 16248 bytes
SHA-256: 5eb0efa01f7e0158179b60ac8af2784bfbb8633a785fa50161e6965946fd02c2
font_01_sfnt_off0000e53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53F 10440 bytes
SHA-256: 3f406a4bb647635b850149110d6f013c1ffffbbad1eeb9b3530e058adb97bdc9
font_02_sfnt_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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