Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35bb202a2d73a36…

MALICIOUS

PDF

84.5 KB Created: 2021-08-04 01:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3bd28fcb988f2a8db4b38ab34536b332 SHA-1: 439e7c091c6d1bb1ba1b48cdf3791bbfbccac484 SHA-256: e35bb202a2d73a3627ec62b0fadfc337787f11f9c14b1b53e105456e4e01b4bb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://industrialsupplies.pk/userfiles/files/91478882720.pdf In PDF document text
    • http://hf1968.com/clients/48820/File/rawalezumunevozumekovavu.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/tmcqahmqla447fa6dd4csrjn52/99528153190.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/1605599212.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/13252279791.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/67142224616.pdfIn PDF document text
    • http://jucal.es/images/file/wuviz.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/fakakategipuvel.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/86884719076.pdfIn PDF document text
    • http://thegioioto.store/upload/files/faribesetolibok.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/32911054972.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/zulapizozabosakorami.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/7559b029c8247fa4143d408f1450d363/panagiz.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609867c2890d0---37943022981.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/d58f154snecdbb2d6lcj4ugkr6/45739562753.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/53388426401.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/jedopilaxopukolu.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/wekuradakogozo.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/nuwofuperomagifutoxof.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/84634253705.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/tosefarasowunid.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/126abe5266a16e38a0c302404e346527/29509271410.pdfIn PDF document text
    • http://susanjeske.com/clients/82887/File/96691039009.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6c7f9b92f---juruzekesepawazenewituzul.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210624_AC9B20DD65BDD21F.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=employee+awards+certificates+templates+freePDF link annotation
    • 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_off0000e57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57D 16820 bytes
SHA-256: 2d52c822664a54ba608c1b83c709a1415165a3bca247c413b59ba17c750db849
font_01_sfnt_off00011147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001295e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295E 10860 bytes
SHA-256: 389f5417ad6d740e2541f0e95a66ffc8f0db8683bb138b8fed63c0a2f81a83b8