Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6b139f3a63cf8c…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 06:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4b2f1e63b3223474a456b67559f9e0a SHA-1: e84eb775fa212cc0fc4c6c32218841378f0e590f SHA-256: 6b6b139f3a63cf8c789e5c110f693e2f1b754649fd585df39f34903539d89d8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=king+james+version+bible+pdf+free+download PDF link annotation
    • http://gzcil.com/uploadfile/files/wojolomenidodafabugi.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136858ad1037---76990756463.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/1663362573.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/soruminufo.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/jirapupegudeliv.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/67240063760.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090803554778.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/37305224973.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210909_1279A9F81DA282DE.pdfIn PDF document text
    • https://greenways.at/userfiles/file/posedixitek.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/melebaxalizetezobov.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/popejuwinifut.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/60573846646.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/35007351699.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/48242820857.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/1787995165.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/67450686471.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2c2b323bfa2eb25f905274949a06c74c/janemodemesosemonozu.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/29124591746.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/18812638706.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/62640439389.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/givatunemov.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/rizazotatojokalopepobo.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/hnrnk3vs9vji0vahvqn1en9lq6/zadidorokowus.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_off0000cd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD86 17252 bytes
SHA-256: 097cbcb3b857e2168cd41e851d1a017449260b514a040318a7e67d16f7f7ed97
font_01_sfnt_off0000fa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11244 11156 bytes
SHA-256: ee9a4f95176d34e54f2d162c06e9e199f70e10ddc063b2de27358720ad28cac1

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