Malicious PDF — malware analysis report

Static analysis result for SHA-256 64121713c7d2f7d3…

MALICIOUS

PDF

77.1 KB Created: 2021-09-03 18:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: daa30cb679ad56181cb0ce067be9029e SHA-1: e5093421b32a6f6b2ae423b9f501a12e8b0406a5 SHA-256: 64121713c7d2f7d3ed7e1b3a606325d6c3f47101cd8d8bafdda8c67f4420b900
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of external URIs and link farms on potentially compromised or disposable hosting suggests a tactic to distribute malicious content or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=image+to+pdf+converter+freeware+download PDF link annotation
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/19683144556.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/gdhvhec6lchm7sjaqfk0scdtmp/52896425721.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/vosamutulakupenuwisozoke.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/f32dh8ca8atoc578efo4fbkv82/witutujozetavavofi.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/48416681245.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c480783351---valufavam.pdfIn PDF document text
    • http://www.bandungmesin.com/file/kizagegunoru.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a722b64a372---tamodiviguxuravamas.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/jemumagusaji.pdfIn PDF document text
    • https://goodline.by/userfiles/file/faxetuxazun.pdfIn PDF document text
    • http://julianina.dk/upload/file/36541807839.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/fesegawajukodaputobit.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/88032359685.pdfIn PDF document text
    • http://myqself.com/upload/files/bumilorozovaxu.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/jonutulotagoxajoraxujid.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086af771e170---bamiputijufazerapep.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/8585664110.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/8g3r336m7e4i5aakm1s7eqat00/polupunipulijuj.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/sukimabofeponamu.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/29200313301.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607539742031a---fagoder.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/76089346026.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/14256960958.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_off0000c886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC886 10808 bytes
SHA-256: cf14951792f6e7f3e87afce71533e9deb35883b8208b743100e5286ec8036d29
font_01_sfnt_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 17448 bytes
SHA-256: 90ebbef619607bbc28c4eac6845b9972d2b658909c5877ca1f848bceacb901de

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