Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfee742ba67f1df…

MALICIOUS

PDF

97.2 KB Created: 2021-08-08 18:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: fa03b2e488b9e23ac751ecf87502e72a SHA-1: 6d7155dd51eef941d3fd9e5b28447d3a2a79385f SHA-256: 0dfee742ba67f1df4bec589bd6dafa6dadba4d93ed1a8fe3a2ccbedf86750d7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072483db86e2---1937097518.pdf In PDF document text
    • http://anma.pl/anma_edytor/file/zeledezugenujufo.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/rumorijafubagivufuzowezov.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e11af0803---tosatosuxadox.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079bab35ef30---29924052865.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/molekepofibigilaka.pdfIn PDF document text
    • http://ipublicity.cz/data/file/mopon.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/97889612693.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161003a6a9e48e---xadelofebomokofa.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/34994967321.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076da035274e---tilesutu.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071ece66e405---19561111867.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a512e5953---78626613808.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d4713d3f66a6b390ff135b28f312c16d/vovemivodononuvifap.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0d76699f4---81413237162.pdfIn PDF document text
    • https://majubesar.org/contents//files/39400419813.pdfIn PDF document text
    • http://udemadriatic.com/userfiles/files/namikax.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/2b13432to4esj0j0c3lm2mg0ng/94328703219.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/binalelugemogevisen.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c73dd57faa8---33503661318.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/bemuko.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fee224b4e---xifanopi.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/66846379846.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/fcc3fd5ebd3f7accefd8fe308cb924f8/ribiwofepobomeraz.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e27e940764---5146766515.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/41477749734.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/82337295540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=acido+fosforico+formula+di+strutturaPDF 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_off00011322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11322 10480 bytes
SHA-256: ec198d8b27fcbfa913635545335dcdc6b8a741174dfd7fc3743ab3c4347b2c55
font_01_sfnt_off00012afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFA 20208 bytes
SHA-256: b19e0bf1bb7e5fde26690241a33ffc4842314137ee264d0c100e0f26fb3216af
font_02_sfnt_off00015df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1