Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ad877c161a4f07…

MALICIOUS

PDF

84.9 KB Created: 2021-08-15 02:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f87a5a1532bae7f26369a29b74116d7 SHA-1: 487925bcf2f1c14e1296192654bb9775fd259725 SHA-256: c4ad877c161a4f07f075aa01a79d73bcb91a0dde1aa6279997438622f72490f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure itself appears to be a lure, with the document body being unreadable binary data, indicating it's not intended for user consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cengilli.com/icerik_images/file/foliparegaxazopemugi.pdf In PDF document text
    • http://abogarestudio.com/userfiles/file/kipogatifejabuso.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/95155498840.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/jifuzovaguxupodijokedawu.pdfIn PDF document text
    • https://lasanisports.com/files/musizutanofifaraloke.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608234669635c---57266519104.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/81345637240.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/86288004045.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b98e432c8f---77117175212.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/buribuxivudoduguvepa.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/60710036224.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/7521747b3dd326ad6a8279e10d1fa8cc/vuxolarav.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/36563708323.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/pelekitizatojopabomakexox.pdfIn PDF document text
    • http://jacksonreunion.org/clients/71346/File/zilevoborimel.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bb105e834---53516657467.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/tibajalinobojobi.pdfIn PDF document text
    • http://chinalabware.ru/d/files/pipal.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/miwapedunepuxazigot.pdfIn PDF document text
    • https://digireg.org/upload/84648729880.pdfIn PDF document text
    • https://webaprint.be/img/file/bopabu.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/lomivimoxezemunejunaj.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/nakolasopetisovopebijoxe.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/verirotilipimul.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210530165028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+remove+lid+lock+on+amana+washerPDF 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_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 10868 bytes
SHA-256: eb8ce4b4cf49e9b73e0c44d12aa9d43afddfce287f018f2a723f7f598e63a8c3
font_01_sfnt_off0000ff9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AF 17024 bytes
SHA-256: 8f0983c10a20e7f14bcac91f37f03f2751b5c100819124332b3c31a17d20ebf8

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