Malicious PDF — malware analysis report

Static analysis result for SHA-256 183b3da5d774e12b…

MALICIOUS

PDF

92.4 KB Created: 2021-07-18 03:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d398847cd0f3322e381c186f03f5b7f1 SHA-1: 1cec8c8378cba7bcc32e47bfd1ace543980b75b6 SHA-256: 183b3da5d774e12b7813abb0bd5a86c2c30d938c6fbaed681cbc187121b23bc2
236 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The document employs social engineering tactics, specifically the 'ClickFix' lure, by instructing the user to execute commands via Win+R or a terminal. This strongly suggests an attempt to bypass macro restrictions and directly execute a malicious payload, likely downloaded from one of the numerous embedded URLs found on compromised WordPress sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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
  • 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
  • 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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e80284464---muterujewovikuvatetutu.pdf In PDF document text
    • https://efficimm.fr/userfiles/files/40226414804.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/h2lcj4e8p6jvj2lhk0cmt07ac0/zetanegezolupisatimuraw.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/93c4948bf3fdaefba104c779bf74254e/zepijofanaguvagatanonelu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/7f49a9d0847d3aa467b45dd798aeff15/20367912707.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/2b13861deb2957f48cbdf18ed08af3cb/tatagu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608303678623a---junibotawuboze.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070866fdfb36---takepiwajuforinadegukom.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/9e44lll490o9tlftho28opc9q4/9934514885.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607041f468368---kebutilonigomodona.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aeadbf30ea6---22817588050.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/36748394186.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160872a8aa044b---rijemudowuxagasefedipa.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b64c39650---15701482715.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e66998ec95e5dda58aa05126104bf3e4/88030361098.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/mevozitimavemefon.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/temokosenojonaga.pdfIn PDF document text
    • https://wasserentkalkung.at/ckfinder/userfiles/files/lodavuwaxekapofej.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///worilawofivopipapu.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/c39b805aeb8236b2e97dd2102d6e836e/6398700949.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/73522715330.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9c300a7cb6428f38be88a7b136380b29/lawegubar.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/r6vje014928keeqp9gaevrkkim/28785335875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=system+restore+from+command+promptPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 18612 bytes
SHA-256: 9fe5d19b5c50cd3ce08419b218fed26cd5e114bc72dc37cfd54254685294e815
font_01_sfnt_off0001291a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291A 2100 bytes
SHA-256: 7a6157a80dc1e9e6ecaa7d22fa06cf26f044eb9957da0f54881590cdec3c14dd
font_02_sfnt_off0001327f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A96 10832 bytes
SHA-256: 4faa7eb24b90048b72a52cface689064cc9d4edb7dff4936b37e0fa67fde7563

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