Malicious PDF — malware analysis report

Static analysis result for SHA-256 73efa5472bd25950…

MALICIOUS

PDF

83.2 KB Created: 2021-08-19 13:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 606998bd2fa7ddd652a7ad0cf6c1c169 SHA-1: 5a2ae45441b6be4a78cffd38bc349cff64e12f15 SHA-256: 73efa5472bd25950216b01ef3a61a97b04237cb278d21eeafd699151b9d89cf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to numerous disposable domains and compromised CMS upload storage, indicating an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/45191462079.pdf In PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce20645e679---dijobage.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/javajarakilixi.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/28405962375.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/33625547346.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f439b8c49---83013842135.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a249d92813d---joriziminisuvubefuzojux.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/34434736407.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/62340236543.pdfIn PDF document text
    • http://cichanski.com/Upload/file/81021219262.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/mebegodetu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c478c903b---26257761363.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/67389939005.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/65420067710.pdfIn PDF document text
    • http://charivne.info/images/file/kokus.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/gopesev.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d63e6c81d---fuvuxip.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/84701994840.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/goxijodege.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b525d20865---29339635143.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a42f2d95db---48990277984.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/42568082955.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/xoxebetujetowovame.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/bifigarilerudurezebur.pdfIn PDF document text
    • http://cpils.com/userfiles/file/xufuwidelesozeguwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=islamic+geometric+patterns+eric+broug+pdfPDF 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_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 16876 bytes
SHA-256: b1d5b0b84f68942cd508f280d8fca2afa0cfd87b17b12c7478ef33dad2526cb2
font_01_sfnt_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 11156 bytes
SHA-256: 9ccd7749eb93f4795d0480ef13cc0ea53d89fa264704c84646b9f93a6674658a
font_02_sfnt_off0001252f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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