Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4bdd5ef1629603…

MALICIOUS

PDF

143.1 KB Created: 2021-06-27 13:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 315261f162ee310b48892e39b5ce66c3 SHA-1: a474c85390c83e76c81e40c478995211a52f9e71 SHA-256: 6a4bdd5ef1629603f2002e5e57cad5ffaf7dc2d9a7d126259ac1a98120fd0c3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a distribution point for phishing or malware. The PDF's structure and the nature of the linked content suggest it is part of a broader campaign to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://pasarantogel2.com/contents//files/radozitowobogituwikaxinoz.pdf In PDF document text
    • https://poolpoint.be/uploads/file/figemozusupamax.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/7e4eb801df2723ddcfb52682104a1c82/93107176683.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160902075eaa20---32757743157.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/882cc7d5f1e491fe50c1a66715a49042/xitovobirezobisomadab.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080388bb8681---zosetu.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/85405304205.pdfIn PDF document text
    • http://abpaluso.com/upload/file/45358320534.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/luponibiviwumawiwanilop.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad353b6293e---89002576281.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/28489505227.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/56324198951.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/jevugozafelomevibapujexod.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc82e85c64---98494696728.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/sr7ae0t9v90alb58p95gqk4c2h/xujuveririf.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/4bb041cfaf004937342af840b1033932/wowibofubekereridav.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a62c5bf48a1bd48dac7688f00c81fe43/4481108301.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/46773886244.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210624_054937.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0e79346e---69656730574.pdfIn PDF document text
    • http://naucseto.cz/storage/kikifoguj.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e98b4dd81b---16650555238.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/77c0823546a08877df9f3cd3fe6fd90d/89254032019.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cb19d0576---69810248343.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/lodaguxiwoxarexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=brown+rust+of+wheat+is+caused+byPDF 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_off0001cec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEC1 11020 bytes
SHA-256: ff0024ad25d30f6b84c452cff72f304375e7939a322ebaccb3095c9b9dd39077
font_01_sfnt_off0001e878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2008A 17552 bytes
SHA-256: 673324f4321aa5d357037d737c99e0e14f18b20e4881a8eb2d5eab718eed4fa5

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