Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da908e2d84f87b2…

MALICIOUS

PDF

91.7 KB Created: 2021-07-07 20:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0ec80468341df4cdaeb9263077d06e77 SHA-1: 672e2264f2b0dec784f7cf35a67f5d0bc3b45237 SHA-256: 3da908e2d84f87b2135883dcf42e7b04fec776806e6c6fa2a3e10eebbb170276
276 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell T1553.005 Disable or Modify Tools

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains social engineering lures designed to bypass security measures, instructing the user to disable security software and execute commands via the clipboard or by pasting into a terminal. The embedded URLs and link farms suggest an attempt to redirect the user to malicious content or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 9

  • 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://airconbank.com/upload/fckeditor/file/gexarekedafumafoxul.pdf In PDF document text
    • http://ilksolar.com/Images/Media/files/kazafegijufirajemisa.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/614c32b80c963ee9b1932c53967d7f55/10215169345.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/mopare.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/fofit.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/a2505970aa22d7f0057fa7fccfb26456/70206491919.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ceb4a899---25843336738.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/67090742053.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/66069087804.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d83ae45e8---35523955282.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/87605884062.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/6rioee12qjj464577ao7d31ev6/zazos.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105270525489434.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gotozajugijufipaxanepoxe.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/fuxituzeki.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dfc540929---totadidopuxixalidezosos.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/kmlr9r5abdshen1et6agnpgu43/17254934421.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fefcd28614---90120976536.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/16844671712.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/lijetikeza.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9784ad31fd---8878447064.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/60258115815.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19c8d07aa---seropixazawi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b99c87083a5---gobemozodukarogu.pdfIn PDF document text
    • http://kasargod.net/uploads/file/83422973852.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/72758896294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=windows+10+activate+product+key+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_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 17564 bytes
SHA-256: a6ad436a5b337e693e404d0bd55ec4e1d47317f10e311cca0a000d7d2c609a17
font_02_sfnt_off0001468e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1468E 11192 bytes
SHA-256: 5ccaa65f2fbe01a3c4143beaacba5a781d54b0db7c05c9410c266436ef7670b0

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