Malicious PDF — malware analysis report

Static analysis result for SHA-256 591aa7f4ee337f8a…

MALICIOUS

PDF

73.1 KB Created: 2021-10-04 21:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 794ee17618659f1fd8e792993af6080e SHA-1: c2be86950a3947c0939dd14656757174ae14f456 SHA-256: 591aa7f4ee337f8aea53b08e5b81ad5dce1185ece53440e16e40b0de96906d4e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. Heuristics indicate this is a link farm designed to obscure the true destination. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://coretry.ru/uplcv?utm_term=potential+energy+diagram+worksheet+with+answers PDF link annotation
    • http://indecomavo.pl/userimg/inc/90562854904.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f10b38db93---fedekusenipefumekazawawu.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/kegodigunotutafan.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/83836913952.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/1267095715.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/19432223216.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/40176098933.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161562a7f05162---zasibawulelerudaforix.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/76886970992.pdfIn PDF document text
    • http://mylead-journey.mandiricareer.net/contents/files/kexabunedusunalarujavak.pdfIn PDF document text
    • http://turatabor.hu/media/94367876459.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/mozumibelumamafadiwav.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/38278449516.pdfIn PDF document text
    • http://premo.at/userfiles/file/gepiwuluxobutanasalakiv.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/bazazegulovaxatovopezavu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16134a88ba7c35---tizibam.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/paxemawogebikiluri.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210911015828693481.pdfIn PDF document text
    • http://w-mill.jp/images/file/kevidujemapev.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lovopabumejirikabi.pdfIn PDF document text
    • http://zgic.ru/!upload/files/zogifinux.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021092601015619.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/bimejunuwosumaliji.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/sadebubuxinezunudiso.pdfIn PDF document text
    • https://granitnet.hu/editor_up/fasodanumuvurigajes.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/73014955027.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090604435124.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_off0000bad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD6 16472 bytes
SHA-256: 18b2da981409a8b239cc779bf8d17c8cd95a55fd1baead088214c16b14419485
font_01_sfnt_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 10988 bytes
SHA-256: 12919a15d33f47764c58715cc4b3ed1c95a70bab2f284e1e7af13fe81d4fcd4a