Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf6eab3fa1784a2…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 22:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e5036df02865af8f6a56f0c1f0a7875 SHA-1: 941e4a2f381da4e94257dae10ea4471e243813ca SHA-256: bcf6eab3fa1784a2cd9b1cf6e46832e3ced6fdae8beaf3fc1e75585faee74238
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=unblocked+games+9999 PDF link annotation
    • http://fine-trading-knotwork.de/uploads/media/53785226697.pdfIn PDF document text
    • http://vning.net/filespath/files/20210831235411.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/75547257009.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/xuvoruzegor.pdfIn PDF document text
    • http://matras-devison.com/upload/file/womuk.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/modet.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/64062ecad7b19aca043bbdbc5d893733/3910404740.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/mexufalapu.pdfIn PDF document text
    • http://katachizu.com/img/news/files/16241599865.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/9e47b30dd9cf6ddb2a95974e5aec6819/36432221750.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/rekagozeluxukaxi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161358484732a2---84092456663.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/dezasejirireti.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/43575072447.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/15567478314.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/49936020172.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/rulesi.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/mikebupaxadumudadetilofap.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/pikimedabajuwew.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/15243784290.pdfIn PDF document text
    • http://sudeoksa.org/userfiles/file/20210903072117.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/41a0to5hu0jbbkdufr0av1mfp6/wodatalif.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/wububupan.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/87421214705.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_off0000d70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 10832 bytes
SHA-256: 5ab72495d71e818b4ceb8e3e7818828f4032ba7e781cef2f4da27d5683af2bc8
font_02_sfnt_off000107eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EB 17864 bytes
SHA-256: 52230afca6e42955907826842c82377bc3f5dc7f99351a66d942808a42a983e8

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