Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec88a80824933958…

MALICIOUS

PDF

82.9 KB Created: 2021-07-02 05:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e61a86c7faa00769cf313041a9bd9003 SHA-1: 4b47e8866c369cf3c376c9043606684f74a7551d SHA-256: ec88a80824933958facfc9238936f7f82b688c39520b1c48538987444d397ec0
204 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, presenting a fake CAPTCHA to deceive users into clicking malicious links. The document contains numerous links to potentially compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b67e83f1440---16892980101.pdf In PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/vajijek.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca18d26752---83431920672.pdfIn PDF document text
    • https://betibg.eu/webroot/img/files/zutisizinirasibakomod.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fa9683828---gusaje.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/4601fe26e91e1484308e26ff5e06e9ad/41246326797.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/vadejosakowewuvujuzuzifu.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/45f4e043430d50aed05f54f1cccfab6a/814485510.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/49981318998.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/74791778973.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/83835250477.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/253220bd50188a2392a9402ae722ac10/zakuz.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3670fa87eb---xowefexexowudagunejujila.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/jilekisekarijotexabijib.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d910469ba7---vusexodewanogenipir.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4885ecb5e4---vuledamimidagegeturax.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac2c40165c---88178116927.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/dajosadipikiwuwidebus.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/kopopelitipixelidamikozi.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/nowuvatutavadukuragi.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/86693855317.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160753e62bcd98---73358713324.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210628152815.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6af3772b0be8c1564e932ac4a1f16ee9/dilegewiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+sword+and+shield+game+download+apkPDF 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_off0000df37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF37 17652 bytes
SHA-256: 2ac222126a7aaa42e26462affb3ed259022b179948bc4650f411c41a89515561
font_01_sfnt_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 10920 bytes
SHA-256: cad7205fffd0963c40999b53b061d87bf11703dacdb8de2c09a2adf03d4b1106
font_02_sfnt_off00012639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1