Malicious PDF — malware analysis report

Static analysis result for SHA-256 753e99be5910486b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 09:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4319f5dd2a62e8dfb73805411933546a SHA-1: 93534406cd8bba90502814042dd029ea2a0d21f6 SHA-256: 753e99be5910486bc14133bb9b0d61008d808d78383d098f7733f97253946fb0
156 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. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://oniceh.ru/uplcv?utm_term=preschool+shape+activities+worksheets PDF link annotation
    • http://sillajen.com/fckeditor/_upload/file/30800076602.pdfIn PDF document text
    • http://bociany.sk/media/file/32859613211.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/dekerazabakexuzeti.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/jizuj.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1843hjlv657k99f7ev2ti5cjkj/69138624654.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/duwotudotutinevuko.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/69925945278.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfef004395---9161974781.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f58e5f6f2---subosakugoluzogi.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ab0337134---97824635979.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/tebomuxetigowikakawugamuk.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/akl6mb2gtt9rlrbf65c4ru7afb/54645077281.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16102ddd8a8113---17921431720.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/8af498e745581e70f1284041fd56c73f/sutavavevuzexoboronutab.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/wawebumoluvuk.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/karupafosoduvimamurulori.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/memorikonikarabapen.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e6d4f0270---jisewegelekezolifufixu.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/panavabebobomefepapif.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/bfb8b3efd65193ffbda84b035551471a/zamupunazotowe.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/a4fd438edb7bdf21e81964f5514e0dd4/28005544433.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608459a9079c7---72581028878.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/vudepam.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/darupewegal.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ab8a8a8c6755cdc8eb6b7b0f5fd5c1c/77899384044.pdfIn PDF document text
    • 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_off0000daef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 17164 bytes
SHA-256: 0c2fb8bd391ecd8215080afbfb39f7f15c89009dbbdc10d5b3ee1388fc4bbfdc
font_02_sfnt_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 10612 bytes
SHA-256: 8d9a58e8a9d8ddda8ce5f9b0d57d9389b1e8aa38d5e2a6a23219bb9a35f1b3f9

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