Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb04b782479f5003…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 00:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 04e5bc72766b1b760244048a9d01d855 SHA-1: 71a2f2923c15257ae77e842dd8882feac47dea20 SHA-256: fb04b782479f5003a3c0863ac8daf507a43cf370699bd23896495ef8c2fa63d7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into phishing scams or malware downloads. The presence of multiple links on disposable hosting and compromised CMS uploads further supports its role as a distribution point for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/2dd1250815b96dd4dba2cae9389a8f77/16712045838.pdf In PDF document text
    • https://contact-house.com/fckeditor/upload/file/29388370539.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a403aa036---57158448825.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///sifiwawazofetaxewiva.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/nepifejuvikirikej.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/bafelosesit.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaea616af6---sivezevinu.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/futiko.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/52a5b7ad563e4cae75db56434b621606/bevemamilebojezut.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e60581d75c---vipalidagijeg.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/2277192592.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/b3l3d9bhrm1t80k49rudhtvgsd/pefuwanefopolutosepe.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6472737706---799774283.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/39788227086.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/fuzopexilo.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210517200554.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/98100665122.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/33361960325.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/tolulez.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/51773857743.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a202fb1c22f---36103975897.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ae855c49---75241646145.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/72e0360dd219c525ccede0b1227cf73c/87250259729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=maths+percentages+worksheets+ks3PDF 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_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 17652 bytes
SHA-256: fda096d7d84494a8eca2843531e61a37561502058ace6bc0fda8420e5cb2e750
font_01_sfnt_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 10856 bytes
SHA-256: 3ff1f11e417cac2ab76f581ac0b3cf3c648eb810f0bcb921859d04fcad0c5793
font_02_sfnt_off0001252e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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