Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4092fbe5f24a68…

MALICIOUS

PDF

97.4 KB Created: 2021-07-01 21:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: de367e9837191613cc0681a41440fb64 SHA-1: 72cb7742d220787bb73652d5b50b293e825b9533 SHA-256: 8d4092fbe5f24a68603fdfebe55d29a53900841f0e58742b09d41f6d91c987f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=tagalog+logics+with+answers PDF link annotation
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ea27e5acbdb53b6fff8bf8f939fa040a/80112393580.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/lopilodunurepokupujipabul.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e83b90c25---936791477.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/8cb42874a08b21a6e22c68485a19ad52/wudetukiwurumukadepokabi.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/1993058470.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/j8j8r0ghaq6epofab7dbdg50be/fakamu.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/d6c9a4671d319d0ea75e0ba79df083bb/nifawemitune.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/b9008eb131359bea3e368ce0bb5a66a8/xesuvavubetuderuse.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/c3e97dc61afd7fb94843704db6659201/pefuvajuvevawimimini.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/jinugo.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/98007252252.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://maduraigarlandshop.com/userfiles/file/6446878205.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/sezisutipusororevat.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3787c138eb---divodugupemujajixuxo.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/gemufinegarovo.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b45e0a94305---50004501260.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/pibatimeduxobufuz.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/71907581920.pdfIn PDF document text
    • http://centronegozi.com/public/31404112026.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f774d54fe5---18301557557.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/13d4dc133f25933ba2173ee9ad80e8bc/pigum.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/64293027120.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1dd129edf7---62649586186.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_off0001199c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000131b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B3 10560 bytes
SHA-256: 2bd4c147bf8c4d5ab4cfecbe441d0285c8f1913544f66445dc72c624274b93e7
font_02_sfnt_off000149d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D0 18048 bytes
SHA-256: 7734f3ea3c5e6f93b20d567a907b32f45f9d6ac94a6adf708f87f08849ae1817

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