Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c62d38f42e5f18…

MALICIOUS

PDF

90.1 KB Created: 2021-08-09 15:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6256960de7c3ea9d6cc7e36f37dd1987 SHA-1: 78c09b36bcc830db848c5dbf2d19ff729d0c4f1b SHA-256: 78c62d38f42e5f1825e43c0759e21e8a21970c5c5e94a2de225c3adb88cb5717
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, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of many external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a clear intent to direct users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=what+does+the+red+room+in+jane+eyre+symbolize PDF link annotation
    • http://goldenbaycruisesagent.com/userfiles/file/birinikoros.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d57d17c7be---nubijitasof.pdfIn PDF document text
    • http://agrion.org/upload/fichier/40465698458.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/36113329804.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849cd4c656b---fotusaretobidifemibar.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210722081727.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/vd60e5da8n2t225u0tmg6bm6r0/35118545093.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/697834fb2ca1d0ecd4de3be87f4184fd/xizejiredakokizebevamo.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/8444d2c7852107693e58b7bab25a7550/nebovovegogelokavowufig.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e21f6a6ecb---20851578024.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5edac7b5b---figoxatugamovozeti.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/pigoxoxawibujuta.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021062020060673499.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/60533166852.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f5b3e7fbfbd4054f21cdc075f8d47977/palapalixow.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/r77t9pvhmttc1dgrj8hsf231al/32938969224.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/lipizojefikisewojafi.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/fusebomabikerewiw.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/duwajuvipa.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/panevebi.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/zawawi.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828f6ea3b2a---50979111373.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/04a17ab2b582c31b74c0d0529eba3569/38964763715.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_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 10948 bytes
SHA-256: de98809b03bda4a86ed1e96d63b31ae63c4d4ddfb4986d1ae05bc838aff3e6cc
font_02_sfnt_off00012bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAE 17504 bytes
SHA-256: 2bd3a36e27fa53b1f1070c8b1e18a09c9489d8613367a8bbf76a7dfcda88f88d

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