Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cec636b1dbaa759…

MALICIOUS

PDF

78.1 KB Created: 2021-08-22 13:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 29fdb7f198dc1807f5342b822e5e5a4d SHA-1: cc5f7f466ff159e65e198b2e947c092b63ddc849 SHA-256: 4cec636b1dbaa759283702263a6b4cd64311e16de472349fea24c26a8e6c1e3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. While no scripts were explicitly extracted, the nature of the links suggests the PDF is intended to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=inuyasha+capitulo+174+espa%C3%B1ol+latino+facebook PDF link annotation
    • http://rilta.net/userfiles/files/totibikexa.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/zutuwozasalefakogobaf.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/nidulu.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/82531429681.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1ef7df50c---basiserukatelonivijajav.pdfIn PDF document text
    • https://iohrp.org/f_files/files/9828242269.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca121c18f---fepurug.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/l0cnvenmub45d1kljifo3pt0f0/mekema.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/19846903899.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/95913752360.pdfIn PDF document text
    • https://digireg.at/upload/kuraluwokobowufiniwodulet.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df9c680b3a0---dawuvole.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/96745085642.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607851edbf679---vobobozab.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ie46e950a1b1toab4l03et9nkg/pabutozaz.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/645883b353382e7bc85eed7d4e5e3220/1873074766.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f34f48a3b4---72895956702.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/cfd92bda579380abd8e1c21ea23e0429/36752358388.pdfIn PDF document text
    • http://bjallstar.com/upload/file/negolojafixaka.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/57234194500.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/jatamarewesoboravaxutab.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_off0000cc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC34 16676 bytes
SHA-256: fd009a4f955cf176c8758e0f8e9a20f35b56973247a94180ce575f3b3756cda2
font_01_sfnt_off0000f5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E13 11260 bytes
SHA-256: 22b1956b27509d0efaf158a83b5917942a05a7510a05cd88b9e3bca184d395b8

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