Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ca71346e7f6ce8…

MALICIOUS

PDF

93.1 KB Created: 2021-07-24 04:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b9b2a3a57a2bc56001cf5c218410e5c SHA-1: 195516949e5471f7f8774283538f53175593681e SHA-256: b3ca71346e7f6ce8b191730688bbe49b1bbd4497f0f9877feb9e6d43f76ca730
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a fake CAPTCHA prompt, a common lure to trick users into executing malicious code or visiting further malicious links. The document also hosts numerous links to other PDF files on compromised websites, suggesting a link farm or distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 7

  • 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.
  • 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://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/hnlcg59ene7g3ppp6tsbo87o3t/poxakofiwenikabur.pdf In PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/rs37go5k9tg30j098j6e8qafc8/69831916181.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/39273375421.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160775d0aa9e0c---5450472984.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/2144edd09dee0bc2e14e00b35b9136a5/75795863740.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/861bcdcb48b0da46e828fcebd4cbad4f/dujupirakobubudifuvugafe.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6fc6382908a3dc235064db669a89a758/48039563797.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5bdbabc08---22894324315.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb8ac01174---mawavuku.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dee9abadbaa---norirubupofegilagixip.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160749a5625d19---wisepogas.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/229080308.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/4513709514.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094dea07dc13---wepitimujexitefejip.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/xidatusaf.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/niwofevetel.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/8b06b50209efc9bea9bdd49a056e533d/famumaguletor.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/48598471825.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b813431ba---dodupejemukofipofax.pdfIn PDF document text
    • https://amblamy.ee/upload/file/fovejezumedogageju.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607114bfab73a---wimebaxasobelapevar.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609da24f0b2d3---galakexegalofapupodot.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/dd2abd386278ad86fcc6492d91fe7020/97742586838.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/13010359926.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c94ef856cbc4ce88b4df292507bb6d47/badanixevagewavosuz.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/15928196858.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/jikiwepife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=descargar+spotify+premium+apk+2018+para+pcPDF 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_off000102a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A5 11484 bytes
SHA-256: 780bdd7df6f9ea6c76058cc667931b596202051deeade10bc8c438151a103fb2
font_01_sfnt_off00011e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 18492 bytes
SHA-256: 1a1f193284cc9d7947445c0984a53ef6c7a0d8311f1e896d265a8b4feb50d30c
font_02_sfnt_off00014da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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