Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a7a11e2817f055…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 18:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 514e583d955c008184be4ab21ebfbda0 SHA-1: 9d78050ee9df899459e425ea0cd06f9202c63ae7 SHA-256: e1a7a11e2817f055d25c0ce4377684e87f9d4acca99c1fb79d51e899e0686184
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. These links are likely used to direct users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=goniometry+of+upper+extremity+pdf PDF link annotation
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607111f9d1503---binug.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/dafipokewibesi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e628f41497---wegimopegixapoved.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090bac8df33d---kategujulodulane.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/693ceee53b07c278b92cda59f4e7cd19/zujirumumirisem.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/97893763338.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/45924813233.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/600d566aa0f08b3fdc9b0d15715e2f03/vegew.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/49488304531.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/45100312222.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202108281459379417.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160717a934e06f---vaxivob.pdfIn PDF document text
    • http://planbmedia.hu/files/lalunawu.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/regemugikafitovujeguxobob.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/16234811380.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611111e88155f---foneg.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf4466b24---20815255835.pdfIn PDF document text
    • http://rotang.net/userfiles/file/gologikutexisofek.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/33027997513.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210624142024.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/99362645971.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160904290b90cd---71181007716.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a6e2e9435---95112688307.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_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 10640 bytes
SHA-256: abbd4ae5c783e57041fecbf5064c0b64f5fddcf734f9882d79d5c7afd9bd7b5c
font_01_sfnt_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 19384 bytes
SHA-256: 9113eed384619e57064e8ca0038a03ef2c1313eed71544798c3672d03b165c38
font_02_sfnt_off000123c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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