Malicious PDF — malware analysis report

Static analysis result for SHA-256 de42d2df1a55c06f…

MALICIOUS

PDF

91.1 KB Created: 2021-08-14 17:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 9c79f8ed6bfde8c78b46db0c7d11e4f6 SHA-1: a976e94833d1bbed10b92343ef3d78d3c80ef8f6 SHA-256: de42d2df1a55c06faf40731c7a05d626c713177e7d18afcc26fbecf280d39904
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and the 'link farm' heuristic indicate a primary function of redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://alyansdugunsalonu.com/userfiles/files/bisipitaretonijumebuj.pdf In PDF document text
    • http://i-daa-wl.de/userfiles/80328019954.pdfIn PDF document text
    • http://darienhigh70.com/clients/878490/File/88046623042.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc91ee3c95---87850387739.pdfIn PDF document text
    • http://cocoal.com/uploads/file/naletivotifemibazu.pdfIn PDF document text
    • http://markone-tools.com/upload/files/18706093953.pdfIn PDF document text
    • https://edarky.net/data/file/gitafezigiwota.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/xifosusuv.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160df92f170ff7---79732330330.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/64986730227.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8baf359fb2---jotozexi.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e19f821327---63065885663.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/notekofegutifaxof.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfe199de1c---bapodelapisuxelawetat.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/malani.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607570e24f1ba---35218911991.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/fulipinetunabaresurunib.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd4e4900d7---49640077781.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/16613079125.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a996cfdf834---67660725063.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/parapa.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/buvudipevuzifigexozetosep.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/7477940ef41ff16f6363866d13b8d5b9/76941718467.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/bd10e185a86d52c358ccfb4bd9eae2d6/91987424565.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/73573875784.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/6c2c8e849b65583aad5285f61ed3798c/wokopamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=logan+movie+download+in+hindi+480p+blurayPDF 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_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11565 11444 bytes
SHA-256: 0d45cb2898aaa14816c36ec66d402d16cc5a88cc905fd7f4fb1541af4e1f1a29
font_02_sfnt_off00012fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCA 17328 bytes
SHA-256: 7b9f093d612130a8ab677b2769125c866422d144a44ba1ae7e5f73ec87954288

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