Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd28145b13ffe3f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 18:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 289132ed36e4b3c56aeb80e0d777dfdc SHA-1: f6b604ea083e2e597909a4cf0fa64415f60c8046 SHA-256: 4bd28145b13ffe3f3237def142bbfe64dc8937705a926926c1f03d97ee6a5dd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a URL with a 'utm_term=w10+update+20h2' parameter further supports the lure of a fake software update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://queure.ru/uplcv?utm_term=w10+update+20h2 PDF link annotation
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/11123316603.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/67773330357.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/zorekezoborupodototeve.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/35509773554.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/radar.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/40757854554.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/nevofomativisabewezagojof.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/458a03d2a88783f56eb802edf3b5dd80/gejedudomiwarulunosoj.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135c4a752078---mawuxuluvalopozeledagefa.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/28372703142.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/sadovudegilabif.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/41733446048.pdfIn PDF document text
    • http://capableapp.com/uploads/files/85298174096.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202191_23318_489.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/60727729140.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/29269213355.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/98892713086.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/dnbblk12nhabdusiulhfqcb481/bufuf.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/35028669363.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/kerukatelewagixosipametad.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/fidafalefe.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/3104940983.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135ad115f8dc---masasawiwalex.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/vejuwisaluvojugugi.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/19934895198.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_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 18068 bytes
SHA-256: acd75e88538f9766c62e23c573a7a49ce5b7f751f9df03b56c00eae4deb310c3
font_01_sfnt_off00010892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A9 10244 bytes
SHA-256: 269dfeecd0d8a657f17786e0569d827ed309b004e7e4d0d8b4bf46ae9508a57d

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