Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e86dd27983f89bc…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 12:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac42bc251bb039ecc68771308dcce79f SHA-1: 0a455c22cebb1c65ca0133734f049db897d69b5c SHA-256: 1e86dd27983f89bca1549ab338db17e0fb3ccc9085cf081d9057fa37c22f99c2
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://guruvinodji.com/Userfiles/file/dokidepuxakoxeralaxiw.pdf In PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8d231e9b0---27962035611.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/rojogajoxuliseb.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4sfbpfipqtanv14v1j20rcoab/87503793230.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/libekuruv.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/kupetasab.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/bifiwifabepujizo.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409a210cdf3---zavogewimofoxix.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/30356176246.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/finigimenokotezujizudinun.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f339ee5bb0---kulorodedup.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/xomisitanedev.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161430c4312f5b---87803843273.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/64723685242.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/gomotetefit.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/50797554256.pdfIn PDF document text
    • https://airxps.com/userfiles/files/popojojalafekaneduv.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/80373949271.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/27202136445.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/ladidewabibexuw.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/23327956213.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/94676874109.pdfIn PDF document text
    • http://dakov.hu/_user/file/6059980294.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/87985042383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+pptx+onlinePDF 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_off0000d20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20B 10164 bytes
SHA-256: db6e421374284b6798968ef9e149e3df7ee572c3158af487dfa649275af86978
font_01_sfnt_off0000e8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D4 18148 bytes
SHA-256: 4068b903a20053afb6666a1a4f7a10d92e6c5d781584294f8e74eafd188c5030
font_02_sfnt_off000117fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1