Malicious PDF — malware analysis report

Static analysis result for SHA-256 301d3ce4e9dcee35…

MALICIOUS

PDF

90.6 KB Created: 2021-08-12 07:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 999ec615b82eba8c377f6d5fc6db1bf2 SHA-1: 3ddfd62418bd69617dfb41aa1327e0d11efb4d0c SHA-256: 301d3ce4e9dcee35a7ee890ec12b26369f179c65fb112fbbf20360e26647d393
156 Risk Score

Malware Insights

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

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, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary purpose appears to be directing users to external resources that likely host further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d3b12f7e4---bowupiwuwufawowidi.pdf In PDF document text
    • https://workinhotel.com/upload/fckfile/26338237685.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/88cd8e0f58a2bc4460073cc222469a81/zegune.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/mopimobusebirijiziboz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071624b31802---sezozipiwax.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/u3foj76k7h8nbjeu888u7d7e6o/52615741035.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/musofedolupefexaboporori.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/80158706032.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/miroti.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/wovonadibigijojonob.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75f49361d6---futitibozefugura.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/54827265711.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/fegiwopesuvuwopoja.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a2dec8675---33377661404.pdfIn PDF document text
    • http://stevis.cz/files/file/dogedugekevuvuwofu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095f8c4963a1---koris.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609020bbd2f78---60362255318.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-15/20210615224551810974.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/fejimezugovotirixevif.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/96588836131.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/83268477381.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6c53f8fd0527a8ba4432dfece239780a/tenosemuzuza.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca92471e9b---2363309891.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/fezefuxaxoberokagifa.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/ginex.pdfIn PDF document text
    • https://onlinendttraining.com/files/rukaxesugebapewov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+long+does+it+take+to+prepare+for+ccna+examPDF 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_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 16960 bytes
SHA-256: b009a22be764b2158e7020bcb84dc503e0b8e4366841800e28fa6611bb807dbe
font_01_sfnt_off00012a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 11232 bytes
SHA-256: 02ed0870fb11cb4928cd4f22c6b4fe1217502d8606c5db06cb690298052af69c
font_02_sfnt_off00014451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1