Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93f3d7e894dc535…

MALICIOUS

PDF

71.4 KB Created: 2021-09-12 07:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5036a71a3d7c1280faa67068f1b6b0d7 SHA-1: 69c2ccfae1af513a0ca89fdc544fa32edcc7a094 SHA-256: b93f3d7e894dc535cbee6fa06a2adf73f9c387b584c624e6a1e383fd9198658d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or associated with compromised content management systems. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://farmaciafoglia.eu/userfiles/files/bitowem.pdf In PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d6dbed9a5---44566825449.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/wuvevanusoxarezazinigijo.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/63474923465.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/33952659557.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/kekisizugakekorexiwasal.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/xobufabekumukoreze.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/16951942161.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/2971531004.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109071907222155.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/16887288643.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/xutovipaxakebukofakudir.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/tedawovoki.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/samoxawedosa.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/zitop.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109112133226263.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/fawit.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/3713f6a2365203aa28558f572ffa66df/86371682074.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/aaf173f4aa936200523e6cf015b0d787/57408587606.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/46157084985.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/92104541141.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/jebefigupazanituxip.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///85404567345.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/96159001572.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/vowagewulujukosuzonalig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+is+the+use+of+firestickPDF 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_off0000b5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EE 10468 bytes
SHA-256: aa9547f68a84ff3b8f614041e292efbdde56ce9fc662ac606ad26a20039599ff
font_01_sfnt_off0000cded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDED 16356 bytes
SHA-256: f4e6dac3f2cb5963767589cea54d3d6c124c945f50847ab24a4b432a2e193daf
font_02_sfnt_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1