Malicious PDF — malware analysis report

Static analysis result for SHA-256 368a8113cdcbf669…

MALICIOUS

PDF

93.9 KB Created: 2021-08-07 04:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f267d4744c3bf924ea8a788d4b5b9de SHA-1: a42a32141aa3017c8db878cfa3659723a022d4ce SHA-256: 368a8113cdcbf66948804e3f2b848729c570150553d7ef66096d03682bd62a94
204 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains numerous links to potentially compromised websites and a lure instructing the user to copy/paste content into a shell, which is a common technique for executing downloaded payloads. The presence of these elements strongly suggests an attempt to trick the user into downloading and running further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://brilspa.ro/userfiles/file///17482425160.pdf In PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092c1c204282---dodifanoxa.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f4308d06---81720861411.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dc5398459---16891470351.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/pilotanozuxanijupasigut.pdfIn PDF document text
    • http://hak-al.com/resimler/files/fopopidotivosuk.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b677e9398---46037058774.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/36688015779.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/84120783613.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/9197246860.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/9071300655.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d3326755b---nufivivatezirawulaluvajab.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/15322949201.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f639e57a84---konoligupadegeja.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a37774bef20---37775670285.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/felulesivuk.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/39523096864.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/48275646126.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fbacd1d7c69---miwetopefejexuvod.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/mobupafomuzelinewuxe.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7112b1f9a---dopilosazobogozaxoz.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/54c6bcff688819dad77e0cbd1eb09138/mejuluxijurexutimuf.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/vuselumunuleriga.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/m2k8ppogmjo3fqor2t7pg52b78/94290549238.pdfIn PDF document text
    • https://medtek.vn/storage/file/51973377020.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/metekone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ben+10+omniverse+1+game+download+for+pc+ppssppPDF 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_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 11244 bytes
SHA-256: ee5cfdd86e99064e85435106d07fc7c7d3d294ee879957a4c9837bcc26b9df6a
font_01_sfnt_off0001229c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAE 17696 bytes
SHA-256: 477c26ae7f1b797da1ec05f21abcd75fe6303767fd066bc1396d748e42cbdb14

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