Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9e8634f0e6b544…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 08:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4b2011986bb3023d6150d00268adbe6 SHA-1: 030edc56459c7e123a9fc0e84ee5df007fca643f SHA-256: 4e9e8634f0e6b544f4038de0528fb76b2cf85ca68777e6113500e2975df4b6e7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://langumeistras.lt/i/File/wegetugusadudowidepu.pdf In PDF document text
    • http://ridendo.cz/files/file/2118814466.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/85618154543.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/jaropi.pdfIn PDF document text
    • http://nessium.net/userfiles/file/rizupufumuguwozirubojefi.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/borugefabimepusufil.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b3662cdf9---fixumumatuwudutagexij.pdfIn PDF document text
    • https://slotpt2.com/contents/files/zarusov.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/netinuzit.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/44522768113.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/basojiruzuzonuxe.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/lefitiwuwegemuwuk.pdfIn PDF document text
    • http://metzlerranch.com/userimages/gaxunavifuzitalimeromax.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/75255218541.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/pojobakug.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/wisapinudulepagokenavib.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/vijepawavikosawovepuk.pdfIn PDF document text
    • http://konberdbio.com/upload/files/sasagufe.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/68kej1nbtkbijj56014mr723rj/taviralevoxekajede.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/19258156385.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/fagiwefa.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021981645307117.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2d071086d29710810de221ae8ace5344/wurigazalazadisasuparew.pdfIn PDF document text
    • https://senfina.top/uploads/files/22689586899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ertugrul+gazi+2+game+downloadPDF 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_off0000ca71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA71 18364 bytes
SHA-256: b658184c66c333a89e0b28f05b64e75b099b5e879a54989d25d1795f2c70a9e5
font_01_sfnt_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 10772 bytes
SHA-256: c34ed3bd6d78b8ea1f800955a862c7d627ad8de113bcde710b128781a24a73e1

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