Malicious PDF — malware analysis report

Static analysis result for SHA-256 a773db3acca0c476…

MALICIOUS

PDF

93.0 KB Created: 2021-09-04 21:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5afd0182db5475f8b6a282ce5f013e48 SHA-1: 8f71563c4ecf73ad8c721cba834e786450903a92 SHA-256: a773db3acca0c4760a4d530cf6c55c5851cfad2a38d5b7bcd81b174cebb096d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or 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 this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=optimization+methods+for+engineers+pdf PDF link annotation
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3a06f26a4---fivumuwidid.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/nopufepabiraw.pdfIn PDF document text
    • http://solsethreunion.com/clients/f/f5/f56c6d7ba488b74ef40bd02d3fc4d0b2/File/detofujulofo.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/37620992375.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///36568995130.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/46496945646.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/tirovuxogonegibap.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/damesatujopener.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d2c19e441---48253910095.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/61652834150.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/jesibesawejuzelupu.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/lixigov.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/22moak61havv9dd8j43e3jfu52/kekurajigumorejimod.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/181541499845.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/42910532035.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/9297908344.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/37260506651.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bb7a137e---sofovisuk.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/detozodisamibivix.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/liboso.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210614_DCB4B03F57C17E1A.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/jenovusokisuma.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rshvto9iasd6cri8pkhj19pu8i/vapijeloru.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_off00010565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 18428 bytes
SHA-256: 4df89854e5d8cc8f04c9cc5e99f14546aa9d828f12b9031a5914c52965bd9129
font_01_sfnt_off00013552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D69 10984 bytes
SHA-256: ac5f3271efeb49140270cc458044cdf122bba98204ff7961ed9792c4e162c9f0

Open this report in the interactive analyzer, or submit your own file for analysis.