Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c295a1d80cff1ae…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 18:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b72845a715a067e64bb48da00669b0e3 SHA-1: 5f97df65f228509ba0a7dbb6304ee21ccf14cda5 SHA-256: 1c295a1d80cff1aee09efbfdc304917c85fdca6e80d6cc3506959c95a083e647
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting it functions as a link farm for phishing or SEO manipulation. The heuristic 'SE_SECURITY_BYPASS' also indicates the document may instruct users to disable security software, a common tactic in malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/403880024b7f20aac5c45e3f19c4a72f/nikorebebovuginovibufeta.pdf In PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/1230e90bfb47fff10db242fcc411e934/nebuv.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082d2f0c72e7---jisotewe.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/0ef86e0e204e613deeb7fb0be19951f9/97676777218.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/xegaw.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/relos.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/43883990370.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/71a1973f06b8f3c62547f98f0c441351/kerowomano.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805c6c77525---bozemaxafove.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e15721ff02---metezopuzefoje.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0bf895396---56080102642.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/tileluluripulu.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/60197114312.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fb2f402d9---32630704859.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/e940781404558ce255cc33030eeafd77/39472915619.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7add30ae---40510557850.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7dff857e5---84999560089.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7c7e8aa792babe0be18173876043caeb/pejunolujiper.pdfIn PDF document text
    • https://bczenekar.hu/files/file/30261396749.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210628082655.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/eca9a37c4610a1e698b8ec9ce1fb3b5b/7844868913.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4946aa9b71213f3f96691678599d8024/87357048996.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091775b42477---15231107684.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609102f56b948---getogejoxijokolagivenumes.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/20820326549.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/meuksko6qdnn8m180l188ulmcv/53697726066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+many+sentences+can+be+in+a+paragraphPDF 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_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 17320 bytes
SHA-256: 62fdfcaf52d72830d66d99707f86b53a8c6c6dbc849cfc7a44d01a01c4157cf1
font_01_sfnt_off000117d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEC 11104 bytes
SHA-256: 52eac99ebf8bac76801e64b33e0c0dc3191240b50a5abde7dc0591ac7e4df321

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