Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9103d7f57394be7…

MALICIOUS

PDF

71.9 KB Created: 2021-09-12 22:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 47c3a7965b411940307675bad6d38763 SHA-1: 8414ff589828edae3322cf7233d8baf0502bfcd8 SHA-256: b9103d7f57394be728789c80a2f79a024d1ab1c5c9dfad56ae7d9f2af3b3263f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0821e9355---misorumoranevazewinobax.pdf In PDF document text
    • https://escaletravel.com/userfiles/files/pikenakeko.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/22862958367.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/96032884199.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/19203318142.pdfIn PDF document text
    • https://matricula.arendic.cl/files/39860911786.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9bf84d655---53186531115.pdfIn PDF document text
    • http://nktrading.qa/file/files/46475419598.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/87514849166.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210912080340.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/nijipegivunagusofa.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132274f379b7---2225385731.pdfIn PDF document text
    • http://calisnt.com/uploads/files/modedif.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/82786914557.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/61125370268.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/tuvuzexebidale.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/zeruniwidaxote.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/78859167279.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/1064261565.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/23149888541.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/gijut.pdfIn PDF document text
    • http://leruichem.com/upload/files/92482021287.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/43901706902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gujarati+motivational+books+pdf+free+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_off0000b240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB240 17392 bytes
SHA-256: 7a2fbc379674f830f07093c18a7bb8d9f3d558c06059a47b49acb058701ea914
font_01_sfnt_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 11312 bytes
SHA-256: 8d2f7a3e78aab8f0d61b1f7c80b239df1fa7aad0ee910ed859f4ec2624910306
font_02_sfnt_off0000f944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1