Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8fae2ea8215385…

MALICIOUS

PDF

91.2 KB Created: 2021-07-20 19:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a069ce4c1ecaba5a4500942543fa5197 SHA-1: 2ea0b5e262cff939487fd9014bafc19c815db7d4 SHA-256: 2e8fae2ea8215385e750dfe58535eefc13c9cfe9091a06b8f83ea80b3cc99de7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/15607584753.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d587e71948---febejin.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/26298529016.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/u5tbeo5604ori8hdvrj1pub9ep/zurovapolowotixupojita.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/abac3578d653cbb03a6aaf15051f9f3d/kiwimevobudotelat.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16095d8e550950---guvolisegige.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/37c028d431790ff4148f9c1cd1154dc6/3311492670.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/c210b7155184f74d76b5d18180dbc84a/jibajaxegedajanajevim.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/18ur2fa5lucln7cbedu1cb0riu/85055373615.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/melukafujifet.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/nevubabosekivule.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/4627382497.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d3fba0dab400dc7d9cd1ff8587560939/58415585592.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/76665822336.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/90d4592a9de3fed3e1cb41bac1e5aef4/gowazoviwesegejux.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/mawetikofo.pdfIn PDF document text
    • https://flomogroup.com/upload/files/nofexesokadovemomevebe.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/01ck9r1iqms83cite1rjki91st/47984999141.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b63367bead---kivesonixojodegovoguzovo.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/67174583923.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093f733d4156---vizegefipefofigasajitiwe.pdfIn PDF document text
    • https://soechi.id/userfiles/file/fakusoguwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=holiday+inn+bexhillPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001042e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 10328 bytes
SHA-256: f60d0eb875c8e52d32a51b998c4215959e137962f1fadfd72ebefceb6215fba0
font_02_sfnt_off00011b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3E 16220 bytes
SHA-256: c9d310e3f05ceb503418a5299038822c3e71cafa139d12e33d730308607643be
font_03_sfnt_off000130d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D0 17228 bytes
SHA-256: 7811f5d101e21483cc3a25000cca7a731b0dee3aa767782ab7ee1ad2a1a7b89f

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