Malicious PDF — malware analysis report

Static analysis result for SHA-256 463d3c657784ebf7…

MALICIOUS

PDF

84.6 KB Created: 2021-08-08 21:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3ba8878e8bf8b9719540401c22c72e20 SHA-1: 55c8ee71237e1887d803712cf9746e9ea228cf3e SHA-256: 463d3c657784ebf7801c7b97d52c6ec8cf65bafaa70d52be487f71f3fd50765c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9414

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
  • 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 https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/ebe9735e6df86e4bbab115b12c513a02/26395685582.pdf In PDF document text
    • https://svetplus.com/userfiles/files/84728729266.pdfIn PDF document text
    • https://securitydm.com/slicice/file/mirijofa.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/muzovuzazefijoba.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/kujoxej.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16090f45da043b---piwiva.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b1cbaaae7---79998619590.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/67714324936.pdfIn PDF document text
    • http://exosushi.com/uploads/files/zexinug.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/85870305883.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/lumekuligo.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/pukeriwukir.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f853f2ed08---13234684560.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/benubanu.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/45261978760.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/53006759799.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/535bc9aa8cb2a89e3cb22a0694e2cb7f/bazixebenet.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/65905011134.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ggr1f3mkdj9iur526dlnbr7uqt/bugipimijagefebilunisu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8023a6478c81040e6efbeb1bcd72511a/povidapaxipelatalerijikid.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/51785201673.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/421b83863e6077af9ba581dbe661428f/53501860294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=importance+of+ethics+and+morality+in+human+lifePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aca38c8a29---1043943908.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/45925d2de00468311873d20468e88d2f/56150883047.pdfIn 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_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 11052 bytes
SHA-256: 6d080afdf94b07139e28993e203bfccf86a5efd69f354904f3cb0e664d21b879
font_01_sfnt_off0001112a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 16324 bytes
SHA-256: 49a17af83bbe964ac8e2a7fa74a6df937a27cdec0ccb751e6ec60930fe8e09f6
font_02_sfnt_off00013b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1