Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89d977e0ef6908e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 05:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 97df742309abf946da69cc4bbc2e5bd5 SHA-1: 81100c88e35573fd0cd64292eb8e226139f1c46a SHA-256: c89d977e0ef6908eea7793aa960be307b5d0be11c4290183ce959ab82b6f3f21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, pointing towards the exploitation of web infrastructure to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://realxenon.ru/uploads/files/boburadon.pdf In PDF document text
    • http://pataibicaj.hu/userfiles/file/lijupuwuz.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/denalimijuvaki.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/gimakorukatamipozinan.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/b1n3j9bqckfs9bbg4t5u497nul/10207006607.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/dubelivusijadatasuj.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210919_E6F831C8B8BBF3EB.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/fd129485df85f591714ea5ead76b7f82/85397064281.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/kulaxanazaxap.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/2144440896.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/zuvewozedejubud.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210907155028.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/14787340166.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f10be8fdc4023cb64d5ce700a9e6e612/37205153208.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/wizanujorino.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/86244138319.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/saxigizasokiniboj.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/48480153193.pdfIn PDF document text
    • http://apismorava.eu/docs/siwubadugara.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462cc38b7ba---jawaf.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/69379812613.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zopezobaverijidixofu.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/babotugukolafadivuri.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95744326677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=transformers+the+game+android+downloadPDF 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_off0000d8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 17852 bytes
SHA-256: cb04fc48d25fe07696f6e4437e99e1a42dd402337f1296c117766eaa63c9d3a5
font_02_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 10852 bytes
SHA-256: 5f8fee6c88d89a62950b8fc655b7cae5685d76eef28b11ed6512ef84025df402

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