Malicious PDF — malware analysis report

Static analysis result for SHA-256 2783793705c12e59…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 20:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3325f3fc3d3783b82f056d3365ceba7a SHA-1: 4528d840a947eba94d11a6572125a29b5a661b8a SHA-256: 2783793705c12e59590bc5a3867d59efb92892ab1f27f08e3108776099b0def1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://consultingexpert.eu/fckeditor/userfiles/file/mujudadakuzoka.pdf In PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/35696400461.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/57526419280.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/12054445101.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109060137446895.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/7d93784b9a6ae32db877a9654755a583/47383899839.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/75772063678.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/rajoxesumakibuvurepasikal.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/97601939867.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/34782520622.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/f70f113a0c20a469d21f7035b9d2b537/lorutedijexovaxisixut.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/60475373783.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/letiti.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/26782183381.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/71422053493.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368c80b0572---9269278488.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/tamomefagavawanego.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/dopizufisavixuvesal.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/14428957654.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/8350919010.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613750b080e16---waritujalox.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/taxivive.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/14265626561.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/9633957522.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/42483228586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sims+3+obbPDF 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_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 10012 bytes
SHA-256: 8dc84bd15af5ce81483ceb008085fa7cdf755aac115746b88e30cf90b9c61734
font_01_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1C 16784 bytes
SHA-256: 4c1004e0e07da0cc6209d1c113a65c2a82ae7412eac91ff8b7a28c39570ac3fa