Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97637187b5a6ffa…

MALICIOUS

PDF

77.7 KB Created: 2021-09-04 20:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: fed2689cf74677048e33ea9b49af9c38 SHA-1: 49588d9b44db9196d248b7105714db7115902ccb SHA-256: f97637187b5a6ffa5e2ca79e899192222513fccfd4b534f3680909671746a505
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://p-jtech.com/userData/board/file/76169225197.pdf In PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/remedulomuwepetijet.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8cf8c0ad7---72070785597.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/86149391546.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/mujamajabuge.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/lmboa5b7cdoapbl1an7rgttf32/72941954903.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/07d2d0494b25fa07ac7ccc82e0e02069/60776058660.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/dipibu.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/7983398845.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ae612mjv3vqk43idnnurfipvmc/jisadamonoput.pdfIn PDF document text
    • https://petek.biz/resimler/files/mezumanuratesuwoloribi.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c82cecee6c---megoxunona.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/22961358411.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/s7jnihev08j18qgvg2njhn9fu8/femotufelezujux.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/45669108933.pdfIn PDF document text
    • https://bczenekar.hu/files/file/29686942404.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/sunajela.pdfIn PDF document text
    • https://sambelteri.com/contents//files/67488291382.pdfIn PDF document text
    • https://unosms.us/userfiles/file/71678493786.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16082c1a9c0e9a---22036431316.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a7b675f8e3b19747a70f72338e7ac0c/xanerajavofanomurariw.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/tegomivapopumatabu.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/36482942117.pdfIn PDF document text
    • http://dges.in/userfiles/file/12345734372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=converting+pdf+file+into+excel+spreadsheetPDF 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_off0000ca53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA53 11100 bytes
SHA-256: ea3f228076bc4546fe5430d90bc9001a390489096839c796794880ccc31510d6
font_01_sfnt_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 17244 bytes
SHA-256: 126f9188665dfa47841fe5a6d8bde2b66c09a16b500b7bc1ff8c102dcb697190
font_02_sfnt_off00011107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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