Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efca8d5dff24798…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 18:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b64ad813f6cc5f6759b422c19233931 SHA-1: f4a3bee0c6a47f8e23cac8d1cdd8202940e59c92 SHA-256: 6efca8d5dff24798d00fa8c685cd177ec8d3a0393124a6534cf65b73036141c1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into providing a password for an archive, a common tactic to bypass gateway security. The numerous embedded URLs pointing to compromised CMS uploads and disposable hosting further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://siriusdynamics.com/assets/uploads/files/pepowatonofijegubejelo.pdf In PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/55528268313.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/67867271098.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210707201942.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/82734482168.pdfIn PDF document text
    • http://synergyproperty.com/images/files/nozowerojevorafeb.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/derumipumiwomunolemisa.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcc9db1195---vutedaxijizejilazexof.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/73242193662.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/bixob.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/ruxefa.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/vipafax.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/rekidupog.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/pegadosaw.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/gazom.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5549da2c3---wibajiriseloduvowida.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/dj2lurqim8lu1qksfkpmgkqles/54210890031.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/zefebonilasoruwuri.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/76376126690.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5beb675236989d9232bcae7280aea9f8/juretos.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/zaripijilow.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e91a5ac16be---tenoxipapepexuvepezap.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/nivikevamodowobev.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/1463376191.pdfIn PDF document text
    • http://runo34.ru/attachments/file/mogubixipajan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=compress+pdf+file+to+rar+onlinePDF 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_off0000d7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 10692 bytes
SHA-256: 9ab4be33e549bbf705cf8d6e830808d960de6954e942dabed7d4545fb7df901b
font_02_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 16560 bytes
SHA-256: 2ab6d2507b6138909e97fe99493ecfe1b09b4835da5af7ff57e2b2c4b2a9f64b

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