Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f36b15f93818083…

MALICIOUS

PDF

123.1 KB Created: 2021-09-08 06:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5f3874de0b4fd18e02958b6c033bbd3b SHA-1: 95e6863d898f588a3fdf45c24d22b671df9f9bbf SHA-256: 4f36b15f93818083aca0b2d85d098d448b52eaa7983e43bf0fb6c77f4c055966
204 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or trojan delivery mechanism. The presence of a 'download button' lure and the 'password-protected archive' heuristic suggest the document is designed to trick users into downloading a secondary payload, possibly by disguising it as a password-protected file to evade gateway scanning. The numerous embedded URLs point to compromised websites hosting similar PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21d19d94ac---68445188165.pdf In PDF document text
    • http://almar-bus.pl/userfiles/file/begubifixizod.pdfIn PDF document text
    • http://salinasouth.com/clients/11073/File/wavonulitiwexunidovedo.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/322c74d1cfb141c3f9d671ea6debf776/33623315116.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b7fadf3889c46e9b82a1aa2bdb41cd9f/nopumokojitexunet.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/27260305288.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-07-02-02-46-50-vADKBTe9.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/luzuwurebamanizolijeta.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/7de140b42c284c8dc6306d19cb10a771/17510297876.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16086513ac0c89---wagatolinegiba.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/xufekegajodanukodike.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/nivuzekakixubedunuwixokuw.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/80785223881.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/23531830540.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/78759990203.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161129f37dee61---tirilagidonova.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/33801582749.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/58336812989.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/19087445032.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/karepalonuvotisinipowam.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/xowumefodabijivo.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/14afa20162a9341f8c30d490443a3d8d/81746820344.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210606_A4C764A618EE377D.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/5152532508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ge+multilin+t60+manualPDF 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_off00017ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CA9 19248 bytes
SHA-256: bec49918a602a27e053cfdcf5ac1496033b52c27d19e05bc1334eb0e2f0e5721
font_01_sfnt_off0001af63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF63 10308 bytes
SHA-256: ba94bfb120b7417842f0d6c15c4074d8a572362240de2c3744b92496ce5266d8
font_02_sfnt_off0001c69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C69B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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