Malicious PDF — malware analysis report

Static analysis result for SHA-256 4564a79c4e82d541…

MALICIOUS

PDF

76.3 KB Created: 2021-09-02 19:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 56fa0746bd8cfdf855e0d93dd202585a SHA-1: ae0e063e8ecf8fd48caf1693bf835318ed77e94b SHA-256: 4564a79c4e82d541bcb62cd90a247df183e42a290d5226ee4bf0460a05a0db92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=compuertas+logicas+basicas+pdf PDF link annotation
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d453a0f84f---vapuzofipiteganefakupogez.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/91779136123.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/0608360ab97bedfd28a1dddf01ef8c9b/mekodotemuvavazex.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/36324001477.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/sututijomajabaxaru.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/zowulanenep.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b22ffd93889---55861573814.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/dojefilovinubewobarazoz.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/25d6d559ad1b0d8c3352d7cd75b98dc3/vajolaleze.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/kivk6oda9maslg17a5epp2j96b/39482008678.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/dojuwugunag.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/koporizavoxesuka.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/35067633311.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/53248572615.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/74138967358.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ovrtrss396g5psvcqbnnas30l6/53206724963.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/37580010631.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5401d093c---zijixadasavapijo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/791d6dc11fe736c5a46f38cc802cde1e/83506453037.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/laogb064pib63th0arrp2nkk47/gawovakuxukomizeg.pdfIn PDF document text
    • http://venkateshservices.com/uploads/49446701499.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/davisar.pdfIn PDF document text
    • http://otczenacts.com/media/files/92629707195.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/lilululega.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608da6439fcc2---19085734203.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_off0000c57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57C 17732 bytes
SHA-256: 49d6d125707fe51f8240b5a3d9ed033ef03092ca74b378b832fd36a08f0ed687
font_01_sfnt_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 11128 bytes
SHA-256: 0b7be5369051790da06a27a2c4b8bf059034b12a4f73dc4590afb515342edcab

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