Malicious PDF — malware analysis report

Static analysis result for SHA-256 89dd1895bf1c8146…

MALICIOUS

PDF

76.6 KB Created: 2021-09-11 22:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70f4e7c9cc4601a98a7cffb5f922f9d4 SHA-1: 2b7bb45f2ea7ec783f4294c855e1212c6d5fe2ff SHA-256: 89dd1895bf1c81464d5c398877ff1b048d440584b79916508f155dc009ba041f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs are embedded, some pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://kovospm.cz/fotky/file/kewarewozikubosizozuv.pdf In PDF document text
    • https://4cmedica.com/ficheiros_upload/file/73493117394.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/suwojipedisufumujejisu.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/xofoxowizokajididedevumin.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/e138epbse6vbnfk1no8odtqth1/6097764912.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/73103462413.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/winutexubutafamiliruwimef.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210911202500.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7c68d4d67da577586a91f57b71558bfe/sivezuvovuwuve.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/sigadaninuravip.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/tawogelukije.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/89917544438.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/fafelemajaxaraxije.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133172465d12---1947648429.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310b96c270f---mudaxorebenotiro.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210905124354_tslog3.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/tewesesonujalodezipumoket.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/68848194138.pdfIn PDF document text
    • http://ktcz.eu/files/files/jefonedatevesebasarizeju.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/bigulonezajuribekefejugov.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/benijoxugabuxi.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/18235793735.pdfIn PDF document text
    • http://chongros.com/userData/board/file/ditefube.pdfIn PDF document text
    • http://p-energo.ru/content/file/27634316808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=riqueza+libre+de+impuestos+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_off0000c359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC359 11044 bytes
SHA-256: dbee006f5679eb12b5daefe6ec54b89f7a972baefc783ce0748105bc7f38b9c8
font_01_sfnt_off0000dca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 19100 bytes
SHA-256: 0a9b14f2f2412b20a8e8ec119ccb9e611191a8876d9d8a4b5144ebfa2f471129
font_02_sfnt_off00010d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.