Malicious PDF — malware analysis report

Static analysis result for SHA-256 67dbd75ceb445c19…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 00:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f12bc5187b67409693b4218037dc88fc SHA-1: 436675fd4e2ff33d7007243d64ffab2e4cdff36d SHA-256: 67dbd75ceb445c19f69cb67a5152c017e4256ce9e1dc931eef99b021e947cc4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://coretry.ru/uplcv?utm_term=gta+san+andreas+2+cheats PDF link annotation
    • http://airzo.net/userData/board/file/tafimokutivulizubelivilut.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16137da08a7641---72708960183.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/6e3rhed1of4e5k62epg99aeigu/roromukinibezasixire.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/lubiwesisabeku.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/wipusivexazakejixoroben.pdfIn PDF document text
    • https://anakmeong.com/contents/files/nedisudegan.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/51346880567.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ed15u4kca86varfhsheoi6f5ko/sezuwipafijafave.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/82069968264.pdfIn PDF document text
    • https://inks.bg/userfiles/file/tebagebivuxez.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/68366099597.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/lojojamadepuziwetovuzixe.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/19086146902.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/30104227031.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/09a88d89f9975fd6ae5d384ac2be1cfd/xobezozukupiv.pdfIn PDF document text
    • http://millecolori.it/images/file/volexojopezexuxilep.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/54681069322.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/61196585002.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/dodewofol.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/30968035664.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/27400491876.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/77296658560.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613d62990fbd0---84525974090.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/39390876167.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///54211504715.pdfIn PDF document text
    • http://boldogelet.hu/media/ladirekajekewevi.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_off0000cbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 10368 bytes
SHA-256: eb1f931ead4e2e6131d32394dcff3ca3217b4426f9593c911643abb8f201fd03
font_02_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 16912 bytes
SHA-256: c2a433e3ca7c5e812a7f5da181041587dcb549d7a5c4206bfaf1353c8a9a4098

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