Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f46ee07cc6da2c2…

MALICIOUS

PDF

89.8 KB Created: 2021-08-20 20:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 333deb4924cdfa4c8b8cdd9280524fe8 SHA-1: 23b50d1bb32d6ce7d1f3336bbace37ee0a0b8f34 SHA-256: 5f46ee07cc6da2c22d1031dc884be47b43a2e83cb5001760ae828ec91dc1edcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, specifically WordPress, with numerous distinct hosts. The PDF document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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
  • 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://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791609c1f31---zaletuzogibovemiw.pdf In PDF document text
    • http://meteosputnik.ru/userfiles/file/kezuginaluxekopij.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b564b1d1---pesupojabasajenikasu.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/40850015690.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/tisumewefenobonadu.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/pijobiw.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160cadf9007442---vumufatexepuje.pdfIn PDF document text
    • http://fairmonteast1969.com/clients/876766/File/waxugalamopidiwotorirexeg.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/mekarimimibomonixegeto.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/97426884028.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/80311960555.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/858b659d65ad67ad5c3f65a86bee6558/tedawer.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/sizifekidanasofujojofe.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/sibevekukebesu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b19a8ac36aeb028880c119c441cfce5c/29775622511.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/79881758531.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6kjp9beeeoge6khro5dve1dqs/47728054667.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/o6hvn0gspuujtvcuk5tbhr14ma/lobikojinutudidevo.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/natoluregabumakafanekovuj.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607db753928fa---78192735329.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/sga638tbdvc8ggpi20rtm32et7/riminajipubiro.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c3c6dc689---firisafituvunaxeran.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/674343b8f7f674e76d8529701a4fec60/bojaj.pdfIn PDF document text
    • http://dentherapia.hu/files/file/dowuxojitamujulam.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/4074769823.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/25069959772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=exerc%C3%ADcios+determinantes+do+substantivo+7o+ano+com+gabaritoPDF 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_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 19356 bytes
SHA-256: 778bade006d5df206d17baae9ced73c10ccaa001f2b21c657ddbbd99c0b0079a
font_02_sfnt_off00013b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0A 11168 bytes
SHA-256: 0b9609153dbfb678744f6f0536d09c8dc3435359eba528c50e8d1d073c55458b

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