Malicious PDF — malware analysis report

Static analysis result for SHA-256 7239fa97970318b5…

MALICIOUS

PDF

96.3 KB Created: 2021-08-04 11:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4940281e0549f80796c984efcb36e9af SHA-1: adc1e2a534a5fb28261811e82a6fb2ba5a67b4bb SHA-256: 7239fa97970318b5eda56aa6c253df6b46f2085e37250a832aa2048b62001f59
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious domains. The primary attack pattern involves directing users to external, compromised websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c288a41488e---89924101488.pdf In PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ed25b54d6---bowelo.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/12223073097.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082284dda484---jugabomitatogigikujiso.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/lekevukofokugesiburi.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/bb9qateph91e1s5oahejapbjc2/fawolokipegezujakejiru.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/rutekafel.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a911d94fe72---17593217152.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/97534031381.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5qp0rornr1pts5amivthv7chh/bivilavibamuxom.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/90933774979.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d90b506672---xilatuvibojawereves.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/e26idtvtl46jr1r54qv4g7l333/saxiguxitema.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1fab10c02---42735293213.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/28557900116.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/11988673660.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/b31qqrm3la6nbaead7k4kqj3g4/23740162564.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/ff7b0d3b40438f010621ba88acadf205/motexajizavotarog.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/5893971171.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/7759ff8e3604a0b4ecc677fd0f23f6a8/lefifusipukadela.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/70131025422.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/33615210089.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbb329a9e9---10111502318.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a6ffe757db3d9294508b86d85d73b092/jakimaxunaxovokurezima.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e2db08d6d3a---lekebedefivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mal+words+badPDF 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_off00011598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAF 10032 bytes
SHA-256: 91a42b20bcb686293a929f6736434397b617ce4c443188f8f6dfe05af9f70502
font_02_sfnt_off00014427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14427 17636 bytes
SHA-256: d58df821def8c7b1c3500539667ff855f174b5f396b0e5d21b07e79999318b3b