Malicious PDF — malware analysis report

Static analysis result for SHA-256 5487f350f9bc91ba…

MALICIOUS

PDF

72.6 KB Created: 2021-09-03 22:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 994021213f5269547b9fb340f3d6a1a6 SHA-1: c89627fb4400b3ae4accfe61097f80cd3600af91 SHA-256: 5487f350f9bc91ba6a79543832fbddbb7ac0f978cd26ae13bba5dc52d224be97
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ph2020.org/FCKeditor/file/39042201359.pdf In PDF document text
    • https://burgaseguros.com/userfiles/file/91503351168.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/2669034713.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b648839eee---2814381923.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9e71c1b59b2052aa860e29f7230e3384/ritijotonususufabozada.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/dojijuri.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/xikimifugerez.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/vogelimafiwara.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c88e7b545---6370500574.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/81589181489.pdfIn PDF document text
    • https://grnca.org/img/files/files/mokibumuvalaruvezobaf.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/fibakimeredinu.pdfIn PDF document text
    • http://envigest.cz/upload/file/zunafuka.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/karaxuz.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/vuwunusafip.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/56eaf4e45a496d1a3bb1db57d4e71199/xowizasovamedewefalupusem.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/lilor.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/gaxanasekikerurutamuma.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/ragixiwagafuxenefizu.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098430da5a37---32673724467.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160920634b88ce---kobatoli.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ecb85a129b62cc555333835937a55f04/pazaritoxunekawipex.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/zikekasifoxozopejevas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=customer+journey+mapping+process+pdfPDF 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_off0000b9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D3 11292 bytes
SHA-256: 8f6c258d9758f91bc1b1cbeed5706dd6146733ccafd9eb0633fc9b04b231c210
font_01_sfnt_off0000d432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD432 16060 bytes
SHA-256: 3190198e7eb5859d7773e8742e67defb6a98d3746c53a9bf7c6895d6fcb8e063
font_02_sfnt_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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