Malicious PDF — malware analysis report

Static analysis result for SHA-256 1746e9da86c831ed…

MALICIOUS

PDF

72.8 KB Created: 2021-10-01 17:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89a3adb1e9b196689127fc13bc48ebf9 SHA-1: 1fbe04e4f1f2a6abeeb5312fdfad5b82adb96073 SHA-256: 1746e9da86c831ed1d62bf342175635f8c3f373789ada5c778fc894484753065
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=live+player+media+streaming+apk+download PDF link annotation
    • http://meijialx.com/ckfinder/userfiles/files/wujunuzimedazo.pdfIn PDF document text
    • http://yepuco.com/uploads/files/7566712267.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/407593954.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/lusozitifezokikejojadegil.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/julubatevelu.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/18387461345.pdfIn PDF document text
    • http://upakuika.com/img/file/gunusulisor.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614732147336c---jixexonoridomi.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/540492eb1f781969c2ca8abf940304ba/xadukakodazutizumutiguvup.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/62541735509.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/20707872612.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/92955200716.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/nedilubosunorubevare.pdfIn PDF document text
    • https://taflanelektronik.com/img/userfiles/file/wifasija.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/vavalazawak.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/ximinipo.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/gupadutudetemagorix.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/17981926523.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16156af5412e93---15012010796.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/21513225129.pdfIn PDF document text
    • http://vtaky.sk/media/file/67534143558.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614115d08d551---28999020596.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_off0000b357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB357 11052 bytes
SHA-256: cbb06b7b0d78e7a8f9c47915cceb10e6a8bfc7f3ffcaa74342a0ad7d98de6eb4
font_01_sfnt_off0000cce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE5 18428 bytes
SHA-256: 4074d968dc4707a1da50cdccb081273044463163c8fdda00db96d27f2ace49b0
font_02_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1