Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e414b34345ab3ac…

MALICIOUS

PDF

72.3 KB Created: 2021-09-05 02:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 415f79f202e81aab6c6b4446a75ec99c SHA-1: 8c1ca17d40b0cdd814a8d3b3b92b747a316ee548 SHA-256: 4e414b34345ab3ac97e5903f985ca15bf41ebc0525db962e7f2519aa043ee015
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=svendborg+hydraulic+power+unit+manual PDF link annotation
    • https://sanvexe.vn/webroot/img/files/40415056356.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/82ea0a23427d5de3897f4b1c9c74bb0b/fekixefuzut.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/63959272728.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c5268818c7a---fisozexujujosegefozaneju.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/iue8cidf0681vvktuo671tan61/33031075289.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608254fbd01d0---860552867.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/93884790519.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/lr6na686rvu5t9mqmndpbo23j7/48902916247.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ad488abf4b6b6a638b1cb786128885da/zolatugulixupupaxe.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/fofulixonawuv.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/63939071638.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/46946992378.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/fosagolalagusekegere.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/wofizadokumemu.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/rugodafimenuzomajat.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/12378743345.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16119feedd43d3---31458315759.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160803ed361634---1475012372.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/12727461829.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/55367065391.pdfIn PDF document text
    • http://hak-al.com/resimler/files/falolafiw.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/midex.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_off0000baf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF2 11376 bytes
SHA-256: 11183af109c924ca6208960119bcba20d00b8b52cd034e318f710aaad26c0fee
font_01_sfnt_off0000d532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 15240 bytes
SHA-256: f7f71b5dfe62d0c27014529e862fdb764f28c6d59fb11b384bd8cdcc96736c63

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