Malicious PDF — malware analysis report

Static analysis result for SHA-256 6818ff4d67c3e9ce…

MALICIOUS

PDF

89.8 KB Created: 2021-08-10 02:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9a1ce6f64d7917afcb4d9e42b72b82de SHA-1: 207b7900855d66a9754921ba8be9f2adab42c761 SHA-256: 6818ff4d67c3e9cefb52ac2c758bb4295667a5ffc5ab3c771689f67b1c0e59e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, functioning as a link farm. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://catamma.ru/uplcv?utm_term=comment+faire+un+virement+bancaire+par+internet+caisse+d%27epargne PDF link annotation
    • http://alexanderkanevskyartgallery.com/clientMedia/file/pinopakiwuxapulefemoki.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/dulumufinibavaliw.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/881624630.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852f019bca0---digaludi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9e0a7bc11---36692610061.pdfIn PDF document text
    • http://suaups.net/userfiles/file/gezidul.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/34278445479.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/449119e90348f9d24ea6b474943cc660/88453062113.pdfIn PDF document text
    • http://chemicalengineers.ie/images/vakodaroz.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/robuma.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee25782e978---nesozilogubolisonabuvir.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfefb1f0d7---98682539199.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae43d040eac---13988059888.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/362cdd0d46843505d355478b7e9fcacb/wapaketisodopujofelob.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/kedes.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/pulanerijimerekegina.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d45e172ec71---kawugabilurezixomefudoze.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/vofoxokimixo.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160871af16307e---12985079995.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/57818368563.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/juxewisekumi.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2a6f35426---12181307326.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4cc59d15c---14149099560.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/nigiwejaxepizumogapomoge.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/68789258501.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/a3916b5d2c8ea0c6de3b3f45cbe6f9b6/34730309713.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a472e65e426---kumetakinefogal.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/98373182979.pdfIn PDF document text
    • 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_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 11288 bytes
SHA-256: 8b7f29a34a1d78af5f71b7e8451186a53e2fd169a13cf28a567c6eac9e336271
font_01_sfnt_off00010e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E10 19220 bytes
SHA-256: 487f76f339bd6fbb3ffebfe0f5f04a8bf3f70c7eb4fbdf5f5b31bc0aee14538c
font_02_sfnt_off00013e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1