Malicious PDF — malware analysis report

Static analysis result for SHA-256 340d157cf7abb6e1…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 14:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 502a2eb86da3dda0b1c5f9103dcf0239 SHA-1: fef003b907b67c81620df16143e03a50facc8470 SHA-256: 340d157cf7abb6e142b6ae66964f1333e46c2b61239ffdedf3d4d87e933ee716
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely intended to trick users into downloading further malware or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=3g+icon+not+showing+on+android PDF link annotation
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dddc828aa---33188213623.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d84f1d9cc---1829271686.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/65140366145.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/75338593861.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/giloz.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/dovimeguxenalikadetijuwid.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/dozanalaw.pdfIn PDF document text
    • https://jotelek.hu/files/file/mologivepajer.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/julaneriwosixumofefalexa.pdfIn PDF document text
    • http://klpa.net/userData/board/file/niralanelisixiwefufixaju.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f26e38cb74a0168df8cb21a1445583de/73754801768.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/97718485124.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/timunis.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/46948700838.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/54067088130.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f87416687a---71652602201.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/zabevekububorofegog.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/tizufutowelerefuwaje.pdfIn PDF document text
    • http://dges.in/userfiles/file/zatefudolirararedilokusur.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/40438623573.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_off0000d0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A4 10632 bytes
SHA-256: 6d9abd66190cfd11565cdc05aeece84b7ad9380829d4c99253bab19aec2e2099
font_01_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 18900 bytes
SHA-256: f1cf5132599220e43e72a93464f9a44deb645209e4ce30c5777475eb0d15e4e3
font_02_sfnt_off000118da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1