Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d11e4e6f5385818…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 20:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 958995f8dc60eaa4c841b364c27bf33f SHA-1: 9a3d05845cd4730b62204cddeeb9ea178a9bfb14 SHA-256: 4d11e4e6f5385818cc0c6c6b3dbe319e9bd729553a7b99e8e5d43a731f7d8b44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple URLs, many hosted on potentially compromised or disposable domains, suggests a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://ambvetbrashersclavoghisu.eu/userfiles/files/kofugurodagawupazozusegoz.pdf In PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/brs1q3dimk5ch5f9ubgl9ve0h3/66552324883.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/94596591012.pdfIn PDF document text
    • http://crediramasrl.it/public/file/pakudovi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3954188ae---kofodamikibu.pdfIn PDF document text
    • https://tele-video.ru/upload/files/jokenud.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/27169343280.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/fatojonodapomov.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/58884745043.pdfIn PDF document text
    • http://ashioke.com/images/library/File/jexopolalijuxezapixajobik.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/zisirakujogolox.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/rukixenu.pdfIn PDF document text
    • https://cartolmania.it/file/80200765035.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/xoxapigapubaditor.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161307dd7064d4---pedojerorezewupawabekat.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/43862206945.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/48094331634.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/58257058765.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/gukazul.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/pofarido.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9cf67ad8---22720871033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=crime+mod+apkPDF 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_off0000d07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07B 10260 bytes
SHA-256: ef28f480184e48b681a85017069d387d9171c4c2fdbdb7cb5029fc723ccfc8e6
font_01_sfnt_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 20436 bytes
SHA-256: 533e1a655a0ee96d26adf873cf880771b277465eb145ce0911e92626c1f439cd

Open this report in the interactive analyzer, or submit your own file for analysis.