Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3188562a8c34c8…

MALICIOUS

PDF

93.1 KB Created: 2021-07-04 23:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3ca6b553221c1fbf255edbe8f9f704f6 SHA-1: 0bd814be8977979b82de15aa83c4b24aaea92f03 SHA-256: 0b3188562a8c34c8c4eeba9d9d0adf01cfa9024fac4513150ed3b8c0f0114616
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wastran.ru/uplcv?utm_term=breath+of+the+wild+nfc+tags+download PDF link annotation
    • http://allamericannursing.com/userfiles/file/22938580438.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074062eb8a61---vedubukijuge.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/bfm2qacsv288r3p6ok7mlj8csh/10940683002.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/vugofajisopukokaw.pdfIn PDF document text
    • https://alutat.com/data/file/71407243376.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/i29bul0ruostn602uc9673m1sk/nakepezik.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160721ee6763a9---4225227274.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/mamak.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/13ef44c6d4e390826bd793ad5db1fdf1/72652057053.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/7rq32hclhs12v9su3eq0geo83a/vevinadeduvavexaxe.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/3b6f5a279ec50743b0e85909c4b26f4b/vefolujiwinalixukonowute.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/sofapuponixawodutigiro.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdb769f669---19882117726.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/pufirireziw.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/luvubobewol.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/midubuf.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd7228a6e5---63430537328.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/a571093119e6adfcaf2babcb3b723572/pomuk.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/69074137790.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/n760it3dot4q5n5aq7fa246hf6/wetuviwibilefovojezavufo.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160723acb39759---87350040672.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/dd349tnmg65ae8enp9e9c4s9d1/simonojog.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adf00310b6f---mimifaxafivudoloj.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 10896 bytes
SHA-256: eb05eed680d2dfa2de13df9f6ce46cc517785ce71fc59ff822045fa03de068fb
font_01_sfnt_off00011d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D97 18328 bytes
SHA-256: 7439e39d63e0885cab09c8daab05c88b2f20355fb2e2cdab79918577644f8010
font_02_sfnt_off00014d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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