Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee05d3b3da904bd…

MALICIOUS

PDF

119.3 KB Created: 2021-08-22 07:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 125f2bc131c4c44c37354b17789b6b5c SHA-1: fc2f2e5b3cc220e14ced5c6e6fd9959400e9c4c7 SHA-256: 9ee05d3b3da904bd71b46d1240d43dffe55e9a588ac2ddd5ab3c8d241a918be7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://stlnsk.ru/uploads/file/jijatilizudalud.pdf In PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/pawur.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/tizonedoxadufi.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/nozevobetami.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/97174661956.pdfIn PDF document text
    • http://mousike.it/img_ins/files/bopopi.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/lidamawojodudawezurub.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/95525803953.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/16106905290.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/9948738843.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe4f479d09---12217927941.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c7b3661c86a1f2f6fb4e31aba0ba52c3/daxigofesegusabulejanudex.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/48030938781.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bfa7ab19e2---2997586424.pdfIn PDF document text
    • http://cichanski.com/Upload/file/nepimetu.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c82bedd01---rirugufilepizinug.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/tasovukitadulivej.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/647b3d27824c8b5bba692cdc3e1853e3/25082997673.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/53010272626.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160817ae05e3a6---73363320287.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160784ebde68bd---64166535279.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/12168074413.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8d10e75c---lewiguxowika.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/02adc258ed347a278cd9d9ed01a2bf6f/94513784873.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/zedixawoxoxarixab.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/5033rrv6gs6qs8tav4lmu2cruj/nivilejelevuzunanovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+is+the+fallacy+of+inductive+reasoning+quizletPDF 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_off00016f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F04 11236 bytes
SHA-256: a8d7fc834ec8405a27f2f04f816ead1112fa96ce4214684091a0e8e6e7210ec8
font_01_sfnt_off000188de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188DE 17980 bytes
SHA-256: 30b6df72be22cc577f1fd07248463eb65e53580a32c0ddc749086c6548c502a2
font_02_sfnt_off0001b7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1