Malicious PDF — malware analysis report

Static analysis result for SHA-256 10238bffdba78475…

MALICIOUS

PDF

77.2 KB Created: 2021-07-24 14:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d7d620cc65fe62db0de1a4df8627587b SHA-1: 50be782993f2b8eed6a8d77e0a7525c3fb34a8cb SHA-256: 10238bffdba78475518c3237265b6cf3852e35504e97705c587d3e2e3cd43d73
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. The heuristics suggest it functions as a link farm pointing to compromised CMS uploads and disposable hosting, likely to obscure the true destination. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade security scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • 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://4bx.pl/public/file/34771009035.pdf In PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/b60ef72cf65c7caffc15b1ad0161e844/viwajoputuzuporekusupogo.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/9dbe4a5158b054c21af81734c4aa714f/26413180193.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/kutibekuki.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/jemagijinavexirufuvazeru.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hphmtl3u5dog6ats2b7banc0um/xetaga.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4244229b3---17383024559.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2bacbc5d---berosepago.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/nejezunogemavizikanuvep.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160acc9cd2cb4a---48297853602.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9356110033---63770862961.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ad116777143e5a16984949603fbbbda/51192657013.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96f15234f7---28842833121.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/jatatafasukilakiwiparak.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/wifedofefejotafobab.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/50168647265.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe819e54e1---5511447920.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/rodamezadajajirak.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a514c665673---vajiwurapizawivoku.pdfIn PDF document text
    • http://mega.kz/media/upload/files/fexakomekibavezifa.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/92715342621abc9397cd4cc9cf354a87/sobosivitizuvufufo.pdfIn PDF document text
    • http://boxethai38.com/upload/file/45613738008.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81bddbb12---1984122892.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/vinuralutozelutalo.pdfIn PDF document text
    • http://lg-palette.com/upload/files/gorijonufuvilaxusato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=nefrologia+clinica+luis+hernando+avenda%C3%B1o+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_off0000c515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 17648 bytes
SHA-256: 6c7f4fda2fe139f4542b8d21e2e52f8060185c856ded9322b109c62774f454f6
font_02_sfnt_off00010aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABA 11152 bytes
SHA-256: f2f23ef51f709726d9ffc716360e6fdbba00cda37593f95a2c414caf13de12ed

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