Malicious PDF — malware analysis report

Static analysis result for SHA-256 909e42b233ed91a6…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 01:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 24b71bec7f650c78f6ee66ac21652e61 SHA-1: 9343ff5e880b41114042e1482a4425314e95b67a SHA-256: 909e42b233ed91a6ddff3eb8aeaebd6bee812aeb0e7aa7697f0221a2ce7896ef
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to lure users to malicious content. Heuristics suggest these links are hosted on disposable domains and potentially compromised CMS uploads, consistent with phishing or malware distribution tactics. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=intrusion+detection+system+with+snort+pdf PDF link annotation
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/4322779765.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/rkcjcrfse5tncasain5evitg68/35192256170.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/detegimikutagizimusesaf.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f57fd8e3e0---68022094058.pdfIn PDF document text
    • https://yasacompany.com/upload/files/gifuj.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/zotemuvuv.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/45019022614.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/bikorixe.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7acff5fda3---67065267871.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/59756914215.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/254b4c7cceef81db90c473f427e143e4/40963021721.pdfIn PDF document text
    • https://vicentinacentroautomotivo.com.br/ckeditor/ckfinder/userfiles/files/79898201470.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/27e584be35b51aa9d0856a6eef70ccbd/60889178279.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160718d20a586e---sugawejapiduzexazitofofos.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/30960416115.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/lazotoxupodomutuk.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/68221365381.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/216d40ee4c96415dc7d43f281b6c8246/mamip.pdfIn PDF document text
    • https://bem-sa.com/img/file/juzawerisugimojolox.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/vekafapenujamonopijisu.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/73904128227.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_off0000d2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B2 10928 bytes
SHA-256: dbb024ace446eeb9af4500512d1c566f699f6ceaf10f8fe08941eae40a44ffca
font_01_sfnt_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FB 18192 bytes
SHA-256: b0189c8bf7b9c10da977a88dad750eb3a824d5a6fb0d9b15e87080499659c940

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