Malicious PDF — malware analysis report

Static analysis result for SHA-256 189e00067d7c8747…

MALICIOUS

PDF

81.8 KB Created: 2021-09-22 09:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ebda8dba56527179523899fff330a894 SHA-1: bef4726e2c85517cb1aee82524a261a711a0518f SHA-256: 189e00067d7c8747b0773d76af4f2b05271ced8adddba0761f4184b371addc8e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://stroyindustry.com/userfiles/file/7671020144.pdf In PDF document text
    • https://anctools.com/ckfinder/userfiles/files/momabujomijeliligajegaxud.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/favuvetetujir.pdfIn PDF document text
    • https://blgjad.com/upload/files/tiwopikubajuvomi.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/6f299775ed5e75a655e83d6f3b0c26a7/gufalejo.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/zotobakagadowoxikasobira.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351c8faebff---68350182851.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/fofolajuxerutofobojuloduf.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/dowojekulu.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/kupotudeb.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/46074448988.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/bibopogiwisume.pdfIn PDF document text
    • https://matricula.arendic.cl/files/jutelevukozodofapifa.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/8742454752.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/kilebabewolora.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/95273188115.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/jibesasonalud.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c8594325---52763402730.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/wufiwowe.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/berivofa.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/zewifinevesozujotojeruxob.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/gisenumi.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/31258763403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=multiplayer+minecraft+classicPDF 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_off0000dcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 17120 bytes
SHA-256: 2f1b50a04c354bcf8a39e68f52ad45176e4a0d833790fa023b97d85ea346c50a
font_02_sfnt_off00012106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12106 10728 bytes
SHA-256: cbf2a28d77c541e2fd6672b00f9bd8ead8ef9859e44240c06fe0bbc804e1ed2d