Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be7418d13c56d23…

MALICIOUS

PDF

86.2 KB Created: 2021-07-05 10:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8fdbf4950d1357b8f91ad533f9fae027 SHA-1: 82713ef290bd79a98434c2002b80e1f186d6dede SHA-256: 8be7418d13c56d2347f612778b69af18d2dc7d8a0f7df9ea392456178921af90
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://sostrevalli.it/userfiles/files/28147010092.pdf In PDF document text
    • https://plasy.com/uploads/file/pabosaferosak.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/vakivuz.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c863d115f4c27dd96ee2f3506d226261/13780009452.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/kodoledajexobe.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/fevadejoxoxejogot.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/pamosezimajoxenop.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe66c3474d---jifuputam.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/41093666356.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/bavokebexebo.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/8251385699.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/59307298741.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/95491162240.pdfIn PDF document text
    • https://clove7.com/userfiles/file/zagolisezinujufimosiwelil.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/shllnai1mm7ie5sk1c60mg6v28/23377961325.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b33896be9dd92cc91c82fda696d4a22d/xemexoduxibun.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/64710843874.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609830bf3d66b---99645890843.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608035339c31d---87670188455.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/vuzezizekoku.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/9162860615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=romantic+names+for+girlfriendPDF 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_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 10864 bytes
SHA-256: e18e1996b4640db4635191d75153ef9f000fe2ef5bf7700d13ff1fe9babacc7f
font_01_sfnt_off000107a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A3 16936 bytes
SHA-256: d396f2f3308ae929703a42808a89d09dc2940fa7afa37895a7ed2bbd9a919cdc
font_02_sfnt_off0001338d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1