Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac40bef4f65d5130…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 14:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: abcd0312bc5a7841e44b49da03a52556 SHA-1: a09edf79026606b14cff44b71be4458f05c3db0b SHA-256: ac40bef4f65d5130ad064acf02c93b019a8f23125c2c1e645895eed36fd9a74b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised CMS uploads, designed to redirect users to various external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kavatabikem.pdf In PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/28791107530.pdfIn PDF document text
    • https://ksboutlet.com/file/files/wapexopila.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/56280047832.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/natalixitaronewebojukal.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cae46c97be---84096020982.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386e8111750---32786600684.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bf94ae80e---vegubegumalegafipupujibo.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/belususuriwitusawitipad.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/38992490712.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/sulazejulufuxisagofuleker.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb511781bc---75835033438.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136c9b303b92---52651602906.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/64223424071.pdfIn PDF document text
    • http://tzsunup.com/upload/38901103889.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/50717613993.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/muzolisipusak.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/8336721565.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/kefujajuzo.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/78045857649.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/bevitigudewujadub.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/112309312110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=run+forrest+run+endless+runner+androidPDF 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_off0000dcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 10492 bytes
SHA-256: 57633ea53cbf6cb660a1c0030d4ab7dba4a80ca56f7964fbfab86dbe014c3d86
font_01_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 18540 bytes
SHA-256: a4eafe17d2fd1a265a6e7e4b1f9aa5dfb5c440d0c88181292f63879495a74efc
font_02_sfnt_off000124ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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