Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e98c5c06554127…

MALICIOUS

PDF

78.7 KB Created: 2021-09-12 08:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 045b7f89252c274c4b17b2ce45c4c860 SHA-1: 44b97eb70bde31d72f9bdecc102fc859526e973c SHA-256: 08e98c5c06554127617273cced8cd7166e58d61ac3da5a5ce54d0f76e1ad4406
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution campaign. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to obscure the true destination. The presence of a URL with a 'utm_term' parameter indicates a potential tracking mechanism for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://synerhu.ru/uplcv?utm_term=minecraft+pe+0.7+6+apk+download PDF link annotation
    • http://benetworkingpro.com/ckfinder/userfiles/files/mijelofeguvane.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1fc9b9ca6f485a0f49e6d4981e81165c/11368886032.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/satikurul.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/manolurojuxapu.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/87101629101.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109041255362186.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd0edb1716---9024271337.pdfIn PDF document text
    • http://slsnn.ru/content/files/81812329959.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161354607d968a---60732945526.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/82467898268.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/nopib.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/1523971465.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1ce157cdf---dogixozulot.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/11737235572.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/37615757453.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/serojiburazeseki.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/fatanujuj.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/74093942170.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210911165452_1797873020.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/nusesir.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/49602669563.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/wevekopipigutaloxewomejap.pdfIn PDF document text
    • https://satesayap.com/contents/files/7527817433.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/vuwitujutap.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/vasotabedudabegimob.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_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 17160 bytes
SHA-256: aa9526c22b1aa8fa60a1fb61ec423404e72a2d5b59a3a9dfcf598192f5b57146
font_01_sfnt_off0000fb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001137f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137F 11020 bytes
SHA-256: 6ff337bcbee2952cdc76a9f98f8b5054ce443a3fc01154ecbd5aacca827298c0