Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d64890384906e2d…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 11:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2317dc0f69bb2b1eea7503c9a38dd7da SHA-1: 0ba038d7e86ad447af784896fe8ee98662472401 SHA-256: 1d64890384906e2d573980c2e70fd059cf7e4a4c664a1d4229a6cb3556e07055
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The presence of 'utm_term=download+novel+that+night+pdf' suggests a lure for users to download content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=download+novel+that+night+pdf PDF link annotation
    • http://3mfa.com/images/editor/files/97858306242.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/kipitaditexif.pdfIn PDF document text
    • https://gornjastubica.hr/files/rekatotanelijajiwam.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/42732034520.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/buselosofivukegakaveje.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/354588655.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/kesofalosemexomukixa.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/92848c9b407f117e1f0b19787c6023a4/92901622426.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/vefarawalukebutomifedom.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614554e17ac60---nimigasativ.pdfIn PDF document text
    • http://moretonassets.net/userfiles/2678982402.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/61066424406.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/vigodojak.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/peturuvulegukaw.pdfIn PDF document text
    • http://ridendo.cz/files/file/ruzimafejuna.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/kijasotagefojedelamudul.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309730a79b2---sikidax.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/41668679486.pdfIn PDF document text
    • https://ferropula.hr/files/6807407806.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/mowurave.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/papunekipajitafadokese.pdfIn PDF document text
    • http://varvshistoriska.com/file/39573783600.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/86233349720.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414d7d1eec2---40531766132.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/66616012640.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/pepaj.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_off0000c8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AB 10660 bytes
SHA-256: ae0b70fc60cd86c27fa80ffd7c2cf5918ce27b320cf3f73a9405f2f5b868241b
font_01_sfnt_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 18908 bytes
SHA-256: 750f1681bfee58152dc657010a59f14de5ebbc2a50dde2fa6b16c4301e3a6780
font_02_sfnt_off00011293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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