Malicious PDF — malware analysis report

Static analysis result for SHA-256 7824b17384522bec…

MALICIOUS

PDF

114.3 KB Created: 2021-07-02 11:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: de60459f8ae14284c20bd18db144d194 SHA-1: 3f75769e0a7c58a7320c78aed66f6e6f2ad3ac3c SHA-256: 7824b17384522becd16c0b4320c797993c675e08bc9eb64738d2c23235fb65b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to facilitate phishing or malware distribution by directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://ludifrance.fr/userfiles/file/sunat.pdf In PDF document text
    • http://veronikavilla.hu/userfiles/file/piwodu.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/k5ft123493u2kdg9san1vjg02e/24127904699.pdfIn PDF document text
    • http://beateromer.com/bilder/file/rodikisake.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b08ef24ae1---refiwavopazarajilitub.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/sezimutezutonukide.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/29433718916.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/51025342308.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607350135f098---jugelo.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/65ab8ccbcc2c5f82f39325d41f72dc69/21270272226.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2753263d5---xetidusadamujesesu.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/thtk9m199c7isrl9acpvcgtsmu/gitunoxegisaja.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2717486f6---wufikoxanixusukenosimed.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tisikubopebabolakix.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c29907e34---juzuwimojogetazug.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160748f2173c71---zamafulotemuwe.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/37377202078.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/vixadowijumidubaxikad.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/424981860aecb72cb5e12eeba833afd6/71924409138.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c672f62e46a6dd155b3d192eef5644a9/51703587912.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/505b944fd682b5e028f2eb0b936a0965/46628342081.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72e8942de9---3368376391.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/36378424547.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5164b26c3---47665898432.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/warosoje.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160925c526d337---47993624918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=runge+kutta+differential+equationsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001400a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400A 10912 bytes
SHA-256: 2487bb2ba476c78295b8e722c53a32ebbb021b2524680c8b1a8874d2094a2442
font_01_sfnt_off000158f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17103 16196 bytes
SHA-256: d8ac9227fca862c90739a94af5a49f1b9ca4381a1365c4ed5d2c66d5bf44f42a
font_03_sfnt_off0001868a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1868A 20012 bytes
SHA-256: ff802706c3f42d63ef85299caafdd70930121b062588dee5b8e732dbe0149676