Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc84389778b95eaa…

MALICIOUS

PDF

69.3 KB Created: 2021-09-14 09:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc2c1333219a5ad4866ae757593a67f1 SHA-1: 361c7c96ea005f0f6572f59e1a18e37640815690 SHA-256: bc84389778b95eaac1b26735c58a2d865a7f093e02fa0d3ce9ae0927ced4b47f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to potentially compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or redirecting users to further malicious content. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://pnalog.ru/images/file/jofusexisunawa.pdf In PDF document text
    • https://mtmnetwork.net/uploadEditor/files/73749256005.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/48176651581.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/52913934232.pdfIn PDF document text
    • http://atomleasing.ru/media/File/91739442566.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c99b20be49---jajovexowamapetezi.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/maregokeregugode.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/54653371790.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/kamuv.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b78b16a27f---relatemobomiwakevuxin.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/natazerulesofad.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/fikamos.pdfIn PDF document text
    • https://termoformat.md/img/files/xufumokosepen.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/xizevemom.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/27100364756.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/40220909580.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/02d484da9ab57500bb74688e8c128af7/xomazibifisu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/40g99th3r2dqq2r64jrfpgtatc/veveveriru.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/vamufotimi.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/41438186446.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/bozaxuwozimetasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=applied+fluid+mechanics+7th+edition+solutionsPDF 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_off0000b0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A5 10916 bytes
SHA-256: 5b4440396f5fd84d9c8faf6f365a1642b35e1dd0a629c2f240af8ad2f351ce50
font_01_sfnt_off0000c9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D4 14792 bytes
SHA-256: 7ae7ee96d6f84907851e882b4fafd46501bd5e0f301fde2fb803090d8f352389
font_02_sfnt_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1