Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac40752ea88387b…

MALICIOUS

PDF

75.2 KB Created: 2021-09-08 04:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a6047e33917359d5db5e5a5dabc6574 SHA-1: f730edd550b26f5ae4025650b893d1f73ad09e52 SHA-256: 5ac40752ea88387b24e78ba1e4e4efb088e353fdc4233575ec6c1f31efcb381d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mineraux-et-lithotherapie.fr/ckeditor/upload/files/voromozawifatu.pdf In PDF document text
    • http://jjw-led.com/userfiles/file/woxegek.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/3663457135.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//sarodiwaxidatemopomenav.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/30657905085.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160708e342a451---dozigedipofinuvu.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/71169992108.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd31216474---kikafukuvopowibusozarak.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/64573000438.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4levs5e8nk1iglikahaum5m93m/67959323509.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/76131008050.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/bvpmm7ogocrfhsm1pu4rv7fd83/98402453517.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7921107f0---56402873079.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/tugimagata.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/3572a16b56ca53ca98824d8a652fb820/fomaponedunapowiku.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210701094943.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094322653c52---73056323307.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8b6a6c5aa---48827154136.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xomubofazazeb.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/ragafuwobis.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9ed2a80a9---11557255100.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/pamugujerodasogukajud.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7f30c2fc---56650506395.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae29217b6b---20174439051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=hemianopsia+homonima+contralateral+pdfPDF 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_off0000c19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19E 17432 bytes
SHA-256: 8acb0c26f812749b0513cf7c150c336614a5f5ccbdfbcf37788e31a5a8f09f49
font_01_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 10876 bytes
SHA-256: 64ac74754d6cbca041c209b0e3e572358277894fa34f74d59e67b534e20148cd
font_02_sfnt_off00010705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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