Malicious PDF — malware analysis report

Static analysis result for SHA-256 4675e6d41190705f…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 15:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8b7ddfce2c468379615281548e50b7d SHA-1: 1ea1d43ba24e42d29b2ab7df62193915d81da246 SHA-256: 4675e6d41190705fa2c47cf9b331367ddde24728b78fe909dd3167b2fd35c27e
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves directing users to these potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bursac.net/userfiles/file/89497540749.pdf In PDF document text
    • https://ctsgroups.asia/images/file/36091859631.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/884bb7bcedae9252f59aa1fd9ae0d71f/sewumifu.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/80122096620.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c678c51ef---nitorikisusevudowurikum.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/kuzumi.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051216241133.pdfIn PDF document text
    • http://abwessex.com/uploads/files/kurutipukudakowoso.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092fdf65a8aa---74644992966.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/dujogo.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/29418189643.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/9475182628.pdfIn PDF document text
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e06677b27---torizemaz.pdfIn PDF document text
    • http://bienbao.org/uploads/files/94988219080.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/49103502415.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/b814731f6dd463076fb123f93b7a90b0/71430314890.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/11135859000.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/zugusuxoj.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/mevizokekirudomefaribevi.pdfIn PDF document text
    • http://chinahongji.com/d/files/56436531464.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/nsfspqqjm1eas9qsholhsdh82n/lakelajof.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/41502116480.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/af8f20b734e3d7c2afcfc66f78a563b6/goniga.pdfIn PDF document text
    • http://terrietanaka.com/library/files/77098639047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=find+file+and+grep+for+stringPDF 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_off0000e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 10652 bytes
SHA-256: 70b2f565c6579cc57684c6b5593f449c6255a62955f86ca3704192874db4d219
font_01_sfnt_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 20228 bytes
SHA-256: 9864914c0b9f2f5c6c3dd9302395cfcd73e1be5bef12aadfdcdba421c3d007b0

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