Malicious PDF — malware analysis report

Static analysis result for SHA-256 9353a7852cd7badf…

MALICIOUS

PDF

72.9 KB Created: 2021-09-04 00:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bf9e04745e6ea075bff37b13d4399b3b SHA-1: 3848b312d39138996a97f0022ffeb5e6117da82a SHA-256: 9353a7852cd7badf6aaf657e2d9d14449cc0d9c670d5b13506275132825f5374
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to various websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://www.cavice.fi/tiedostot/files/37114517048.pdf In PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b261c3cd178e49f3d1c2a638cb572dd7/jopetupirikejizukakazofew.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210604_E0D1A106535C1A97.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/gibuxapefefotokelun.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/4a1679dcf8fce0bcf74fb0ef362f8551/lewusob.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/vitopunosukatofofuva.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/vudobepasezavexi.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///38387118785.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/b8a4fabef5ca7182cb7b175f749901a3/togitumevelexefuvinido.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/rogikolizowo.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/38e23472d943ce5e5fc5eeac6ac5a95a.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/zigivozimawusakakanal.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a73d9b264c---vipuf.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/poxeropumomu.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/bafuvamexa.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f97dfbb8dfaf98d30d3ec1831d4bc07e/84533002881.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f77e51d1943c17df22ebba900e266a39/bofabazexunusomute.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2db08b0de---wedanisujenejunimuzexo.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/rubib.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7822dfac5---14070388023.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/94747508290.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b046d7cb0c---33955809253.pdfIn PDF document text
    • https://dineflon.com//files/daxivavetomavunolorako.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/2e160aae71a68870e6f5058b1e77e1ea/89977502440.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/a90gn8lm308g3igdm24og335s1/ramofejojuwoba.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/48796636116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=iupac+nomenclature+of+amines+pdfPDF link annotation
    • 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_off0000baf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF3 16452 bytes
SHA-256: 557a017f82294d8ce35d3cddbb5e47622b126567406db579e7f34d62ec03ac32
font_01_sfnt_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 10832 bytes
SHA-256: d66224a64f9e4cd6b3712362ce99ff42a4146de46047f0847b95f34164c9dd8e

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