Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b71e2f48217a2a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 16:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d6d4515d3a359d16822489a6a1d6ab5 SHA-1: 1d9b1298c627fddaced776f521b15204d0b8739e SHA-256: 55b71e2f48217a2a155d9e3778e2c348800ce69e7203a44514fdf8aee466af8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://queure.ru/uplcv?utm_term=walking+dead+season+10+online+free PDF link annotation
    • http://sea-cruise.ru/ckfinder/userfiles/files/17017743449.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/kekobabuxazunisalo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614138a259bfe---zolip.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/bepalumibupalujewefukiti.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109110831338570.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/segapasezovat.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/44879183930.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/27372529987.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/jelokikoxibitesetav.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/bab8f543af0188c13bf5123a33bc89d9/wanabinebekoresosusut.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/lolexezafarumigekudufo.pdfIn PDF document text
    • https://tipresentoio.it/images/file/65691875747.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/wedamafixebotid.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/xolujowi.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/28746614469.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/notalatajutipowuxata.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/tufofolemomunezamepiponep.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210910130433.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/195a7adf4f4916b632c0de2226861a80/37048244020.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/jiwatepuvevewedoz.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/gagogewulelaxekilufub.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109131445533425.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/24844882494.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/53821944494.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_off0000d9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 18776 bytes
SHA-256: a43275702d0faafa78b2693f6f0e9dab6d9d2e94c97b195292adaa8c98a920e8
font_02_sfnt_off00012198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12198 10688 bytes
SHA-256: 88c605691a12edbb9b3c40d7affadaea7d81bd56abf6ed04bb02998e9aec3b36

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