Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1daa6a75f341ff…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 12:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: edf3bb896a085f67c74ec25074314b0b SHA-1: fd10dd6afe1de7359e0be758f819efc678477ec9 SHA-256: 5b1daa6a75f341fff9a45c84bfaa0283c8fe656174308a0de6ff48094342c720
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to facilitate phishing or malware distribution by directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/45748812504.pdf In PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/1cdb56cf4fc3a99beb7b27f6efaa5158/14426490809.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210912012445.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/jelif.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/sifuwenena.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613075654fb6d---3798547230.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/74456998732.pdfIn PDF document text
    • https://strechybenesov.cz/content/1739270029.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e7455adfb---bifiroxa.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/22305876254.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/sozilibanam.pdfIn PDF document text
    • http://zeci.nl/im/image/62804651168.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/25935308509.pdfIn PDF document text
    • https://tch.lu/files/files/fufesonuzovava.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/fexixarukenede.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/f3ae8b1468f9aa6ebbc4870d147d8772/7064569980.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/2217221142.pdfIn PDF document text
    • http://eko-uklid.com/files/file/mowopijubesarawifuzog.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/repetefeneruzifugiredibal.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/70920082105.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/mokapefasumej.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/33471351268.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/bogeluku.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/seduta.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/xofexexapokanobalosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=watch+lion+king+online+freePDF 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_off0000ca20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA20 10532 bytes
SHA-256: a5d28b27f72322505eb38c149fcd5649e967a64d2f07dfa536b2d39b6b69c43f
font_01_sfnt_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 17420 bytes
SHA-256: fb33be01472949fcb5c33fbf82218612bbf15457db8f1d025de245872dd83002