Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf97b08a63febd8…

MALICIOUS

PDF

82.6 KB Created: 2021-08-18 15:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a4506e0a61cc6ef04bf58a15b7d0347d SHA-1: a8d579d722345977acb2eece85948dbb98640c0a SHA-256: 5bf97b08a63febd80e89487036eeae3dd6229104db1cd022ef90aece5be5f9f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS platforms, indicating a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tropo-design.com/ckfinder/userfiles/files/76643750681.pdf In PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16118416a146d5---zuluxavexovapuz.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/337jsmdh0kv483ig75ad93qi26/53425584938.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/begabimafamor.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/72446322190.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/32239612226.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/1814021480.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/80b8b762d675faf3051e09974f634f2f/wotopofisusobopisebebidaz.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/65326234735.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/pupobibiwakoxowava.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/fatemotuxutoderizedejida.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb128517d8---17330683983.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/pesufajedufojumidikariked.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/lurotiraguz.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/wunepusepafut.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/zaziwuna.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c65e8b79dc7---97903674537.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/2993076321.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/88506947659.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/vokapekoxukiranef.pdfIn PDF document text
    • https://actorconseil.com/files/file/batoboxune.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/lulanowopozatarujik.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/zisepam.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4c0ce08e248566587efe79c1b4e924f8/5602645604.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/gibuwo.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbdb3722de---51921584955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+quotes+in+urdu+for+whatsappPDF 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_off0000ddc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC4 10936 bytes
SHA-256: 663d10d6a44d1f7668863a31201de1cd28666dfcb1ed6d43d6f91f0005832c31
font_01_sfnt_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 17208 bytes
SHA-256: 1da55747763544c8a406cc708ba56aa85df239e7a7ba60392ffe5f9c5e38d743
font_02_sfnt_off00012401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1