Malicious PDF — malware analysis report

Static analysis result for SHA-256 e118ff3b0872355a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 05:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2602b8e5d6013abc69e32c913406d1d8 SHA-1: 43b5b76bb07601cb8fb167af6d71dabfe43b09f8 SHA-256: e118ff3b0872355abf62cb40d07e4bf61c6015563524c8be470c007c390a96d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites and upload directories, suggesting it's part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://miet.hu/kepek/bijusewud.pdf In PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132843b1b3ff---poxosem.pdfIn PDF document text
    • https://wildnaturetravel.com/File/18209282499.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/46111533213.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/52618503441.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/konejizutekeganogu.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/56658869666.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/17466630321.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/31592058837.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/xulegudezikowujux.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161408ba0f2565---59370692038.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/26770556988.pdfIn PDF document text
    • http://findacommodity.com/upload/file/tipawed.pdfIn PDF document text
    • http://roocenter.ru/upload/file/55925667767.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/b4bnj7q1dtm2ollsj6l2i8183a/vebizusasaxibu.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/79839429211.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/48088000617.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/wikifofilibibena.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/41260100887.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/38878673807.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/xulizalusugakuzosipalon.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/52538852475.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/49166621102.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/bitupunutalibarutazo.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/11220333739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=snake+eyes+gi+joe+2020PDF 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_off0000d87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87D 10692 bytes
SHA-256: 95dba73a6240ccd2683699fc4dc8bcc493cd8ee34963ab0ae37a5f6342dd55fc
font_01_sfnt_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093E 18172 bytes
SHA-256: 7d579405be64b62ccb487dc9ee5e6b7a72ed071b6880e83e07d1e6a33bad3cc1