Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a85069ea243e7e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 13:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6fd1ad8a34d3a16a6a40fd164a58c6e1 SHA-1: 967f785f4cac3e83483c539305e50cb0daa7418e SHA-256: d9a85069ea243e7e89191a172346f7ca40625d1faaa36b2b23182aaa6fa29a79
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs that point to compromised WordPress uploads and disposable hosting, functioning as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://crysiq.ru/uplcv?utm_term=how+to+hide+mac+address+android PDF link annotation
    • http://loadcell.vn/Images_upload/files/83119395516.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/32129851895.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/makukinubigunubolixad.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/37055206982.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/23147127543.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/52392382964.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/40212580186.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/tumaxa.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/2694096656.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed90c199a8---6256609202.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/xakugigokinorowupewogoj.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392f009523d---12693666548.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/86738388495.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/jogaridumevelefijovekubep.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b4d7d3e9---gipomapiradadelonetiwu.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/50930757109.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210906_4EBB51CB65BF7284.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109101353278088.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/dosarubibinuwapol.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/91668989091.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/paxebabovepekujatojofub.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_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 10668 bytes
SHA-256: 63cf474f70b53981dc3d3077690b1f249c7aa80bd4d39e747922be8b175ef367
font_01_sfnt_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 18084 bytes
SHA-256: b4c3818f01b485c23d1b248613b1b8101d000433ea20ca6359d204f4803fa491