Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc08124a9d991e60…

MALICIOUS

PDF

86.8 KB Created: 2021-08-03 17:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77dc7b40bd3a61a551c5e60dc5bc66f4 SHA-1: 26553d3cc62e3c099a2a3953ac49a99d9d98b6a6 SHA-256: cc08124a9d991e6098098718f6a168d7f39f61bafb0aebea17a1ad3a0f64a688
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 compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://nomylo.ru/uplcv?utm_term=how+to+calculate+iv+fluid+rate+for+pediatrics PDF link annotation
    • https://nhadatonline24h.com/Images_upload/files/vuxotemudinagul.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/totametatakisit.pdfIn PDF document text
    • http://www.centralperdana.com/file/nepaforoko.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/75287867461.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/8041204933.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/zijig.pdfIn PDF document text
    • http://firegallery.ru/img/upload/36103062994.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/48505123870.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/ef6125aea1d86be2092af455c723f38a/3143803510.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d1d3d46ab---fimurodek.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/ligonu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e985cadfa0---debetowatajugesot.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc2747c56---87075517562.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/fovisod.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/9fb3e4ecfcfb8b3e9185f8a21f165822/30957201855.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/zumukigesoxisinisekavo.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/boqdldgqgo01mhsombsd8253i0/83098474157.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8828bead9402eae95551fe235ef1e9f8/gasiwodugexelama.pdfIn PDF document text
    • https://menu2uplus.com/images/file/makazuzisakugo.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021620177115035.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/73657362309.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/vasebabenabaxodaj.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/nigipoxopev.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/26897363646.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/48407606800.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/d21f4d45119743c709999609a8f746b9/26639528191.pdfIn PDF document text
    • 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_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 17040 bytes
SHA-256: cf1f7aa9c76c98b6b98eb5e47273865bcc83d0de98c0e4dc976d0867c7549658
font_01_sfnt_off00011bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D1 10752 bytes
SHA-256: 958165d6980abee0e733eeda607b2537a2454b9f38df1d60d6cb0e9fe25984a1

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