Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3bc5df7ac8c6ba…

MALICIOUS

PDF

85.4 KB Created: 2021-09-06 05:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ad29bdad76b5cd22ded7eb5e47fbceb SHA-1: 346c61cea6f61bb36ec28b4c1d0d88e3d18750cb SHA-256: 9c3bc5df7ac8c6ba148547e66ebb358741d5d7c2e1cc67f83eb2a13526f68319
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure suggests it's designed to lure users into clicking links that lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nscs.org/wp-content/plugins/super-forms/uploads/php/files/56b95efa8309b1358b17ace1139ec00c/vujukapenesapo.pdf In PDF document text
    • http://stigstudiotecnico.it/userfiles/files/sitavafimo.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/nilodikojanojikuwozaworoj.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/75qf4v9f81n1lp493u3tg8tm4h/tinafumalejin.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/tebiroxuzemesaxixelijis.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/85195570003.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b42a70b8e---zopos.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf5c3675cd---fiduker.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/nafufafinetetujoraz.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/dizewakobiniwativ.pdfIn PDF document text
    • http://dalaichau.com/files/5128937897.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3uh37p3tcvqba65m25taom5pr6/barubutenibuvikubebiwemos.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa874e8917b---kamamisovasumuwi.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/tumofeva.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11491ba2d3---xunosutonolifak.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b18409b10cb---feramowadarikozavonifa.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/bopuverufidebezozagixamub.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/kubapiwotemosulijop.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f3626d9c872607b68e1c2473d7ef03b1/sumezoxowivaziluxusez.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/wanijajofokapepalaw.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/85332963003.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/nphffddr4ja7n6v5301bhq6cd1/kexupuvenedewax.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/6d75d115671cf6ece0fa7eabfc2701b2/82140879761.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/7d5fe86c1bf90533e14efee507cf3726/bamarizimotanagapader.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=chapter+7+scatterplots+association+and+correlation+worksheet+answersPDF 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_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 17760 bytes
SHA-256: fd79020eba982338c87d629e74903648ae66bfad3cfe7e874d4df0dae0fc37c7
font_01_sfnt_off00011615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 10868 bytes
SHA-256: c3816c99dddc809878b49b03fde438e928d8263444fcbe3f2d5f6986b0c7219d
font_02_sfnt_off00012f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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