Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3366408c5b12117…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 17:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 586e72661192027bc513fc732c6c91b4 SHA-1: 44eb76c3e7fdfe7b97493c5796ad9110e1ecac90 SHA-256: b3366408c5b121176d7686327b68387296473ba6e413a47b863a46c8f84cf4b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on various domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to download further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://naszemotyle.natura2000.pl/imgturysta/files/xopijefujesisefunatane.pdf In PDF document text
    • http://jn-zhsc.com/upload/23818180332.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/guregevoxefuxigekin.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141d02de4768---binukodewuj.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/tibafizizuxajij.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/nisada.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/51153816980.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/94458065565.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/suxifadujurorixijavize.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/kurawavupugiperiju.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/11627378639.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/bpfn7dtti65v8vonincrj32nmh/fosezetavesat.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/ziminememiwobivixowabite.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/wamopil.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/13188563502.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/wudul.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/molirefoveji.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/wagaki.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/8098984620.pdfIn PDF document text
    • http://sieuthibds.net/images/files/jalirojufuredewasaju.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354eca45a32---vilijiwejetitofod.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614492c32fa61---71598217128.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/15375222426.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1febea81d---82345240468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=az+screen+recorder+apk+download+for+pcPDF 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_off0000d948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD948 19944 bytes
SHA-256: a3fd7eb4619f54d0a8544a13fdbce6ae71ff4b7b922eb0f9a8bf05c39b8ef5ae
font_01_sfnt_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 10640 bytes
SHA-256: 08add9e80eda05bf7ce31bb18a19b477b611a3d48e5aaf7d0055a3f39162155d
font_02_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1