Malicious PDF — malware analysis report

Static analysis result for SHA-256 98609da0fd8b830d…

MALICIOUS

PDF

88.5 KB Created: 2021-08-13 13:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea80042e82f1c72850567915f22b925e SHA-1: dc22a81b53771de9326c29daabfc2fa15cdc885a SHA-256: 98609da0fd8b830d29bd3dccb035e2df5d9eeb469b0f5a1d785bc6741669c476
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external links and the high confidence verdict indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://crysiq.ru/uplcv?utm_term=aashto+lrfd+guide+specifications+for+design+of+pedestrian+bridges PDF link annotation
    • http://bahattinburyan.com/userfiles/file/74423147337.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/mamuworas.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/27c138ad4b64b6ce81bda8b741008151/82429683116.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/zizudivimusowerarasa.pdfIn PDF document text
    • https://kimansion.com/uploads/file/legokotexegesatu.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/nuxixuwolugarifanud.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/94b25666fcb1152e9d6fe6d5c3fc2c73/kipupudu.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/sopurinaserewozo.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/96773356293.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/6553f85056d751753c1ef9b2beed1528/niwevakugekonomunetejew.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e60ae800f6---5640352786.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-2/20210702184700529631.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/8eda01e72718614459f4153fcb594402/1955126592.pdfIn PDF document text
    • https://mszukam.pl/dat//file/boxopadilejax.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/f3ff9e21a30b9062b33cda81171e68b4/39363607164.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/hlk8mr2p4neh2rv9tep0lukvmf/dedukafetowelipeg.pdfIn PDF document text
    • http://podushka.by/files/files/12987398960.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/mevudadopo.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c92483e95f---64483333909.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b011151f9ea---gasasu.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/5de4447dcb9d0d1cab1aa72d78dc8634/22373556682.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/jalijudirojumeku.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b096de48256---rozakakugeg.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc8d09f6a---zezuxogejivel.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_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 11120 bytes
SHA-256: 06e5a8d49298c3a066525e0971d1fbef17278ae0a2e13ad0e96212773eca6a6a
font_01_sfnt_off00010f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 16788 bytes
SHA-256: 3b1923cca1f8358d0c6c4c3c1b852ebf82fdf740da3f1b1fe8e27e2acb2c7f8b
font_02_sfnt_off00013ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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