Malicious PDF — malware analysis report

Static analysis result for SHA-256 427eda6ef0b32652…

MALICIOUS

PDF

96.6 KB Created: 2021-08-10 15:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e412553ef84d4eb19d1c8a12ca639ee6 SHA-1: c851ae00969e11905c0f3c38933b6ffcac3290d9 SHA-256: 427eda6ef0b3265236e1aff0d1b8f4ec035dc688f784149854ed0c0aa707bfb6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites, including one hosted on a compromised WordPress upload storage. The PDF contains numerous embedded URLs, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://infrive.ru/uplcv?utm_term=examenes+lainitas+quinto+grado+segundo+trimestre PDF link annotation
    • http://srividyaastrology.com/userfiles/file/40579519220.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/44910765424.pdfIn PDF document text
    • https://85097781.com/upload/files/vebeduvovuzokufaditunu.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/4802726818.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/gumubadimiluwelajibazat.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/lu6odl3lokm14lua1e4jojjoj0/liwevapatilawixumud.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/8068658760.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b89817b8a---60954116106.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078bec4d9dbc---64536248054.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a170f8baf19---ravutinakitimevuxuwo.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9ac79d39---5960470833.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/84478crebcijjrqfu8fa211cj4/dadasoluli.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/17222044893.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/90787687765.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b56711ac1---10256154692.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c67437e3c62---ralip.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b1d61b4f669fdf522a966088e2623568/govetagopig.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087de14a980f---ximunuzononotemivopazad.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc15217fa54---89003317499.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/61185484775.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/12642818661.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_off000112ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AC 19100 bytes
SHA-256: f4a1966a9bb6ea68c9894997e3747ad8993b7a79e1460c60d78fd26ac8cbd37d
font_01_sfnt_off000142dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DD 10924 bytes
SHA-256: 9da9147d585b59009185e8bdad65afe272ea2ece111517b9e8ce9daaad7c8867
font_02_sfnt_off00015b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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