Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f701e3172eab008…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 15:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 72715e895533585b95a34244f16795e0 SHA-1: 91a41d73d05062291286af8b14e389c6a7c98da7 SHA-256: 0f701e3172eab0083718a7bb5195ac5f6093f32404f05efdb4155f8da7463494
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as a link farm hosted on compromised CMS uploads, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous embedded URLs pointing to potentially compromised sites suggests the document's primary function is to lure users to external malicious resources.

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 https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/35507204584e51bebb52bffb10d3cdee/41207876579.pdf In PDF document text
    • http://www.lugashotel.com/data/editorfile/kazuxemimuwasosa.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f39527a56fc---wugokidevekaku.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/91032603509.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/wilex.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/regena.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/xigimepeveged.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afbb10059c---88166307476.pdfIn PDF document text
    • https://x-software.cz/data/file/fetozole.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/37533983637.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/26940009470.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/io04en43aippc206o8l37fiivd/jifugokimotubifofisiput.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/567fb44f524529dcfb2d5508297758ec/nozasulen.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/vafaxinibisivuwubedij.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a67036d3dbaf7422defb57019bc5ad1c/60044363429.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/67914161006.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/15532974153.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/24379957210.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/25360416610.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d82523134c---ramor.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/nufurolirujuguwa.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d6dca808---kosisebofuxorupefukoji.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/keforapigigabepepu.pdfIn PDF document text
    • http://babamoleskine.com/files/file/44380928501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=bicyclic+compounds+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_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 10556 bytes
SHA-256: 542e7c74b8b3bd54eb2b15428827b9563cbd3b08f799b8b0642553b75c5cf1b6
font_01_sfnt_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 17296 bytes
SHA-256: 0769e7eb9ed98bed9935b20a1ec5f398cfaf15d54f299d9bf26d3bbc36911e7b