Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0d62cb2896d903…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 02:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a851be6b28715d0b1d45b9c4ee2e610a SHA-1: de5ea26942841a7314a0af964eb3e387fdf5e938 SHA-256: 6c0d62cb2896d90309e7bb9eb8bd6b9a5b53aa120e60f0c1bde2a4983bcd302d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the ultimate malicious destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ad47fc52491789d5984032285710c53c/jogosuzagozigasemojedu.pdf In PDF document text
    • http://masonhn.com/d/files/xibuwibib.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/67048747804.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/sufenatunobobigeb.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74321bef76---wifolonigupezadagegir.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6caea3390d---sidijapibaboroma.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/18788612123.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c91272b5a4ec93011c8a4be5548940a5/mabudelob.pdfIn PDF document text
    • https://mollis.rs//files/69796965006.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/77181732694.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/bewusanekoxeladajalefuzu.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac31becd687---molikonevixegusasalejofaf.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/29836758836.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d924f82467f---genulovexaz.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/wulisiresakuxo.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f995405275---vasuneze.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/kekuzuvejinuxasus.pdfIn PDF document text
    • http://gloria-eurex.com/xorajunok.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/43532804361.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210831015406.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/26068146096.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/87jucmk966nkp38jrebh7envp7/kemajanewutiwikebeburadix.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607705107e836---39964939584.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/pupabo.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/dhqvgm6g9q6qhel6l45olms1o0/29735143708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=motec+ecu+manager+manualPDF 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_off0000dabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 16992 bytes
SHA-256: 7e7260ef738ce63ef0b766b99825860867e328f92e49872a360e0a9b118f87a4
font_01_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED6 10408 bytes
SHA-256: ef251181706419e7d246a61c442ee43d47499a83bb314d0b0ef00226a3ba2629