Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4e3f51760069b9…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 12:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 58a8090993f6d316e931253cb5b712c3 SHA-1: 783b3b54c3b0c0b712950efcc0799b92a7d427d8 SHA-256: ab4e3f51760069b9a2d33677f202ca43aef3b7af3d5ef2ddc6519640a39afab7
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 0.9980

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://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5608142b8---wakovepalotitekagox.pdf In PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/52137847874.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/jifutiwaluwubuzosisobuwi.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/963551627.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c26ca932ced---85662406307.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/18113178795.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/lafixawukajivamij.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/rakizuf.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/76964046642.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/pororuw.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afab8a27764---nodamurezozerodevujatido.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/30375267170.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/eeaf2addc843b8431a4b769a0a14ea3e/roxalijepotidowevube.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/34776160743.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/72144958372.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/9bjsl4cgvj7sp8a7u8sv26bos0/92504730324.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/jomobuxe.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ae190e618---mewulixukuxikesole.pdfIn PDF document text
    • https://rotherelectric.com/files/luninolotu.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160affb4416f98---xagowanajixaviwivujo.pdfIn PDF document text
    • https://emprenderem.cl/files/6899999275.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/bifitel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gothic+literature+elements+worksheetPDF 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_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 18456 bytes
SHA-256: abb7591378a323f62a3f562ef2401adf5fe255a03c56512870ec0a3914f537d0
font_01_sfnt_off000114df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DF 10812 bytes
SHA-256: a2392ff7b8820514cb86471960b3018111d0678c3610fa8c68d817442f4fcf12
font_02_sfnt_off00012dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1