Malicious PDF — malware analysis report

Static analysis result for SHA-256 513e464461c19d3d…

MALICIOUS

PDF

86.3 KB Created: 2021-08-06 13:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d344a5a9e8a9e76f77c095045b16f0b2 SHA-1: e60dbd034d878bcce8ab55d452498295811d3e0c SHA-256: 513e464461c19d3da9e3c74727e62af742511467ec8b6ae65201346b46dd1816
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to download files from compromised websites, with one URL specifically pointing to a compromised WordPress upload. The presence of external URI heuristics and a high ML score supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alltechsro.cz/files/77041216945.pdf In PDF document text
    • http://aquinasnb68.com/clients/9/9b/9b9a52ed12f3b440fa02b6ce64642487/File/82517841345.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/jesefutupogufok.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/92076743203.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/9543496479.pdfIn PDF document text
    • http://redactron.com/userfiles/file/xijuwomowitexofugiwoxazoj.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/af12d9b68af515d8852270b2c7828438/vazisivutadubifukenapowe.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/mejuwen.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/xerarovumisogo.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/87686166577.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/lolupefidutuvamozasu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/dfd0c0a54a878f7ae67d5f5a6a2ac2bc/12277528251.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/82444395025.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/78822922881.pdfIn PDF document text
    • https://andana.us/files/files/9754578566.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6daf185968---56055283922.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/lazemudifubepevenopufa.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927cfb2e49c---sifosam.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/65561766693.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/0c6d78013d1a3e5a30edf87da001ddc1/mamodumarutewupejiteko.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/xeleveruzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=internet+download+manager+6.33+registration+keyPDF 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_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 11240 bytes
SHA-256: 3521e99a0a454f8e7f1766431447083c9f37bb59b5698c9c9f2247c29935dd19
font_02_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 17248 bytes
SHA-256: c314a2c8c504d5c055cf2d7f438e9e49e29a7f7aa1555ef5b00e61ec25038c5a

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