Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa15fe43fbaa364…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 04:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99d0776128d9b400f57542c2aa8d620e SHA-1: 6c861b1b017bb6176717706fdc04564132f393b4 SHA-256: 3aa15fe43fbaa364babede576486ddebf1294560027176f827ce6c58a2b395ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript, detected by heuristic analysis, suggests the potential for malicious actions beyond simple redirection. ClamAV also identified the file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2535

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://wtmongolia.com/materials/file/velixorisonodasogubox.pdf In PDF document text
    • https://genia-groupe.fr/images/files/xuvadafofob.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/sexarivemisaxogavob.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bede71195---zuruzetamerageb.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/40g99th3r2dqq2r64jrfpgtatc/veveveriru.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/taziz.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613e13c1b048d---55399790435.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/rinosinitesipuwis.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/88445944260.pdfIn PDF document text
    • https://tebra.si/userfiles/file/sonosasi.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/960asesjgjatur27rtoi378eu9/texab.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135ef2e8c2f6---rizokupupojilofitamudoz.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/xakoxuxatir.pdfIn PDF document text
    • http://wsm.hk/images/files/65280286870.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/10014999380.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/varixiweka.pdfIn PDF document text
    • https://value.ae/userfiles/file/kebexabuziwepoxad.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/bccfae152d4fdc7d1713e2a1bcb0c595/18716367681.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/11374905251.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/sexit.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/56387629558.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/16236441208.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/84355605080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=harry+potter+and+the+philosopher%27s+stone+full+movie+online+free+123moviesPDF link annotation
    • 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_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 11412 bytes
SHA-256: 3b48d51da5695838bf5fd7da1794e5e97d15cdd58607c20d5eb82565cea78bae
font_01_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 19040 bytes
SHA-256: 872e1a1ba58f8a82fe04b63621ea3fd57494bf4e60d350fcb07af5cdc638c119
font_02_sfnt_off00012632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1