Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc343530f13706a3…

MALICIOUS

PDF

81.3 KB Created: 2021-10-09 21:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 619da3bae909457dec77f55010124239 SHA-1: 240cbdbcd483a75e225bebc264ecd2be59e2f5ee SHA-256: bc343530f13706a3b6a4a97360f254f889326e5ee0c311fc38d3ee8efc7b0106
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2u87t59d66mlsvqlcgu6hi0nag/15729682876.pdf In PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/27520637567.pdfIn PDF document text
    • http://12shio5.com/contents/files/36202290796.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/90384356086.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/65001144229.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/86920282156.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/zovexinovuzugowerigesa.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/pogosunubasufojosuboto.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/9683692796.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/20207989526.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/vukusazowenuvotavisa.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/96907906548.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/wurisam.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/gefukajovarel.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/54h8sv4eifd362ord58uk53nv3/papolemelonivuxokavew.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/vuwuwumezetexu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f94da169c80ebe651a983c8b60582ce8/26398755381.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/24157703844.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/mukakepow.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/88513205357.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/91026996658.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/wavidowabizefufanuvaro.pdfIn PDF document text
    • http://klhl.com/userfiles/file/vozutevel.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2a7a26a1c---16847524919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=diploma+estimation+and+costing+book+pdfPDF 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_off0000d40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40E 19112 bytes
SHA-256: 183922f230eed15818afbb7bbf282bf0927892b89d60f61d05adb88102ffcd4c
font_01_sfnt_off00010598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 11096 bytes
SHA-256: de99e9f171fbcfbe32d108138cda639ea86f9fea9aee83a5ca6ffaf610b07c2e
font_02_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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