Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b74455e829ee18…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 18:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 010db282a320a58c580f7324ba1c1f44 SHA-1: a9fae746c3c33468ce34d27fd90a048e3983ad0e SHA-256: 65b74455e829ee18ad77fe387bb0a95e1afac6e1da148dce8099781c905ebe4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://tch.lu/files/files/doxuveditetoliwalibamanu.pdf In PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c1d5b43eb---84101838786.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/movajavamidimefem.pdfIn PDF document text
    • http://tiquital.com/documentos/file/31213264181.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/47b55708ef930b0f3e94b8a02b28b293/fawav.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210904100618964.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/84701130946.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/vomixot.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a3a1921f6---lugizotorimusofexute.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8648f1f62---14020032179.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/zoxibogosow.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/bumepuxifezegorupefoloxej.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/48380443392.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/8833286468.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/94817230374.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/73307998204.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/dorevigumigumoxiwepuve.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/aa816cb3d19ce52123ef9fe255c29ae5/57138493015.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/duseka.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/95479269429.pdfIn PDF document text
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/xepakelekasubenitemubum.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/97617521216.pdfIn PDF document text
    • http://vning.net/filespath/files/20210906190351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+modify+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_off0000b1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EF 14524 bytes
SHA-256: e6a07df92a5479c0060efbda8299867702ce50d8b09beaed5dc74735bf8715d9
font_01_sfnt_off0000d6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 10404 bytes
SHA-256: 5f08ff39073ec459d0483c05940cc912a063fe6a7fff9c51f7156be448de58fa