Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ee8668dbd66fc0…

MALICIOUS

PDF

74.9 KB Created: 2021-10-07 18:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 70c5d27035c8938aedc937aa45b87cc6 SHA-1: 6c3e78015d5245935a4317ae03ee27a8f2960b20 SHA-256: 71ee8668dbd66fc0e2923bb407de1e42153a93f4a6a69c24328d3ff17ca7b129
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=coin+toss+probability+formula PDF link annotation
    • http://crocepadrekolbe.it/userfiles/files/bemutavejudikedexejoral.pdfIn PDF document text
    • https://istanajp2.com/contents/files/zesekababenatudemanamodo.pdfIn PDF document text
    • http://iucecb.com/files/file/jozefajupuxogenibi.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/lisunusituga.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/93979270301.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210929164454.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/141453301096.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/15285102405.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613665946eaaf---rabubelajojulepisol.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/fobegumugilotubalev.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/64831facc6f6dd76842a5ab96135ac28/kikogesitatif.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e9799290c51893f232e0327e6d8f5673/kedunisejetezosajivovo.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/fupimaxeva.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/42787275280.pdfIn PDF document text
    • https://nls.vn/upload/files/vexuwamivumijumogefap.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/9e9fc5a44cfdc9d7f0e37fe6d01d9e92/60691508533.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/gazoxakake.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6dad42c66c54bbef80737daceaaeb32e/lofimameke.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16156104cec5ee---popiti.pdfIn PDF document text
    • http://quetthe.com/upload/files/74311035106.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/wagenetanaletutevopinuj.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16158339f8c78c---55139241963.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/62935049882.pdfIn PDF document text
    • 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_off0000beac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BE 18060 bytes
SHA-256: f7b54b2f62170329d587a262154d85f16708ebdb684f79c86a44df35ed48792a
font_02_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 10772 bytes
SHA-256: 6cdd220ffe52e6c867b73c97ec8e9f6e10894a3726906344ac8af3bd9f14bd9c