Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bd81efda2c846c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 22:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c363d5fb5bfc71845d16574815698f45 SHA-1: 97395a54889c15f308959962891b1d24340ce324 SHA-256: 88bd81efda2c846c52f8993e133ade69f2d7003caec369421d087137080ce0fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The embedded JavaScript, while not fully analyzed due to potential obfuscation, is a common technique for initiating malicious actions within PDFs. The primary function appears to be redirecting users through a series of links, likely to a phishing page or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=garcia+vs+campbell+live PDF link annotation
    • http://paulgraphics.paulsfashion.in/files/67813099145.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903103048.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/livusapexerosuribu.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/jutiguriwilasedodujinebe.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/bulifuriferovosefo.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/78683727117.pdfIn PDF document text
    • https://ms01bet.net/contents/files/luzuxelojipepakapiwa.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161518f6d30d92---vototigidinanunoxa.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/60878665681.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/1363190767.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/fokojozejavabuko.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/30400298450.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/vofurim.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/43600064201.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/xoxun.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16141458338e55---ribunofew.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/3f197388f5b60d46b53638f2e561466a/vuxaxirumeze.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614165f4b7a0c---1383761579.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d98869db---44787599619.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///57242321097.pdfIn PDF document text
    • http://allier-genealogie.org/File:/rujozuzebetewapewafas.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/55397556679.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/xuponobedutuzupuzokepojib.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/54309312689.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/43365936135.pdfIn PDF document text
    • 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_off0000b38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38E 17312 bytes
SHA-256: 5c87b19b299f8b87f8df7959258e27f862ad6f20fceb8f15e1ba8d8bb68025e3
font_01_sfnt_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 10460 bytes
SHA-256: 7da64bd14c4fbe6ddfce51c91e1dbe4a1b59cb1fc4d82366f63b3db50fae3c87

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