Malicious PDF — malware analysis report

Static analysis result for SHA-256 06e95175582afa12…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 12:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bac161daeed586702aadbbbe90c072be SHA-1: 49cf1287a96abb3484073b1b4b6d78f8a48e73f9 SHA-256: 06e95175582afa12594755522e49dd07094e0c20fd3a36b276d63e31c0c987d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, pointing towards an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/3813bdaf637481c0af2901533e22c706.pdf In PDF document text
    • http://artwatch.ru/userfiles/file/13179272273.pdfIn PDF document text
    • http://wernitznigg.at/files/wupefomok.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/5d996c0f51e91983b8612358c3ae9e20/dagasekuzapej.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/tawuwilejetufetoru.pdfIn PDF document text
    • http://hibertek.com/image/files/20210922_130714.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/efd2436b64de1e7c75751b80aeeff07d/lisufin.pdfIn PDF document text
    • http://klinok-saintp.ru/files/tobutipevojabapinokil.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/latexejawozotum.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/34406391812.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/93248604552.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/17502504588.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/redenugulewonenarilezeliz.pdfIn PDF document text
    • https://mar3ol.com/Files/files/41422061164.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/ravutupodu.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/bf0122a9dd87b5358d961567a90f2795/27079545030.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/paxava.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/kuruwolokumebazibavikudo.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/xuxuguvutonexuzu.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/87450232209.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/kejapopiwedudakilozowor.pdfIn PDF document text
    • https://areicon.com/images/file/vofuzapo.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/87069337881.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca6c499c4---pugaxesisa.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/xewudujefaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=apa+itu+titanium+backupPDF 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_off0000b1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F7 10280 bytes
SHA-256: 8101cb54935cdb11e470a390edd394b147f9f0d1e4294b25149c21604a3ddb7a
font_01_sfnt_off0000c8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 16960 bytes
SHA-256: e594a9e60e2be21feefe755efc441a0247474933aed8b5c5b8f61c92ec6183af

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