Malicious PDF — malware analysis report

Static analysis result for SHA-256 3793e09d1c5e0569…

MALICIOUS

PDF

89.0 KB Created: 2021-08-04 03:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 5d775d12a7808219f74d3451f20ce327 SHA-1: 68ef0ca35c9bf3b93a1873081ec7d3f24ab2eb5d SHA-256: 3793e09d1c5e056936144e701f2beddf6be1ca8a47980bb4b90164e76e6f9080
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to potentially malicious content or phishing sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866ad7d6eb1---95018083672.pdf In PDF document text
    • https://mariellatriolo.it/public/file/moturulubitibuxigilan.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/527090cb683c6d08bbdcdc2df9d6c0b2/60118556744.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/72807387643.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/miwaxo.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5b2b9a8e05d0f28e8261e0906fe7c0af/57730183773.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/konunevawe.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/26745117681.pdfIn PDF document text
    • http://www.bash.cl/media/file/liwujefegiruvulezevix.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c1c72a8f1---fabimokojivoj.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/42212488273.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/zokegurumuberajime.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/45674675838.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/gozokoju.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/firizixanovesipitibuwuw.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecb105aa554---dumimonuzasunerasasiru.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16088b936bd7ac---votinor.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8604aa9a9c938b01d1cc226a9ada9b04/dagapigasosow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d49f3388e---xapoduloda.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3be2e86b4---90310845682.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/sakijogelagupi.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/tepupu.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/50870237b7c9ef09c4faa57cbd53b842/zuzinusesakifok.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f77c376c1a6809de7ede55a5761eb084/bobizalimifixipadomogap.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/50292651671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=baixar+jogos+iso+ppsspp+androidPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32d4a36678---melemizav.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_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 10576 bytes
SHA-256: b25e2ea43ee30c8bc1e712476a5318bceef0f4f74396ab2565e4747b30d8c07d
font_01_sfnt_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 18572 bytes
SHA-256: e5a3f623053e653e2e970cb93408542582346762222a783c712a4afbeddb540c
font_02_sfnt_off00013c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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