Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e4bda7481717d2…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 09:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aff5d611ade23e0fb18e56fe8a7eb5cf SHA-1: 0f3c0e764055400d5dea88b85d4f162c28df3037 SHA-256: f2e4bda7481717d21440fbbf2a17206cb7cdca1d475d7220bfbada94cc2d84b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=space+analyzer+apk PDF link annotation
    • http://a-b-i-s.net/layout/bilder/file/2922517251.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/fekepexuwonuso.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/61565313444.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/35585322034.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/8f702253027540ff5fc76e39d53fa033/26718873506.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16136c2961b54a---45623221480.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/diwesixovuvir.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/56655067057.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/maranegi.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/89446969061.pdfIn PDF document text
    • https://produse-zilan.ro/files/tefogipoxividozit.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/tikesexef.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/wukomoboko.pdfIn PDF document text
    • https://e-room.co/userfiles/file/xilesabedakusiwa.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/50528411199.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16141e82235709---riluju.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/54229850520.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/38695675042.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210913113647.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/58077193466.pdfIn PDF document text
    • http://cga82.com/admin/File/68558938058.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/29892079029.pdfIn PDF document text
    • https://ksuskalology.com/images/file/buwoke.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_off0000d6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E8 10228 bytes
SHA-256: 1cea4e38b92a82929fc97c74c03bd4008b01a911280bb36659def311418c585a
font_01_sfnt_off0000ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 18612 bytes
SHA-256: 0abad3ca0c6561cdb3bef1650179d7f52fdcf73de1381519043514c1b7da13b8
font_02_sfnt_off00011d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1