Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbb2ce103ebc289…

MALICIOUS

PDF

87.4 KB Created: 2021-06-25 23:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9a76d94be4a18a0b75254e76aa8ed699 SHA-1: 06a13f5f60c84c90d09ba16864d6402897e3cbdf SHA-256: abbb2ce103ebc289e3417f681e4074ec9efdd9d9c36bf88ead8cc6cf3bab18bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious activity. While no scripts were explicitly extracted, the presence of numerous URLs and the nature of the heuristics suggest an attempt to lure users to malicious content, potentially via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bcfe6dc01---liwodowamusadotebu.pdf In PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/f5fa1b20e1573068afc87fb19f5227e8/54557311481.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/65318758798.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/tevope.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c795059dddebb95dab787760158f6901/49719718922.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/42213337141.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38c7de87e8---39872975886.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dc071b6ec---87497545589.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082a68014e46---miribe.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/6627062865.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d80b56191c47c2ff0309082a96c44b76/jofabunuxan.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/jawifopubiwimunisafug.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16096d1e38a239---28405154513.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/sotabujularaxodun.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/31887513766.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/daxudenarokotevomadoli.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/c6ea8284908f50a926efe5ddfcab1a20/57898327178.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/wifedofefejotafobab.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/51246efbdec3ca9a6e1dfe3648124d71/17721333154.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5e61399e---62230522469.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081e0cc3ed47---13208189892.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/m1fsdto57vf17njq0h0og1iaad/wupanomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+tall+are+the+dolan+twinsPDF 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_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 18588 bytes
SHA-256: d0e9ef0dd9aceb70cde6db47aaacf881f62514027de051e51ebc1b238e490192
font_02_sfnt_off00013906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13906 10420 bytes
SHA-256: 3d43fc36d1417716a0d6c3969dd219043ac0ba3a03f1cd9b25f7c97bd0c0bd29

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