Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7ebc486b084186…

MALICIOUS

PDF

84.9 KB Created: 2021-08-26 02:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 81a8787c5f93d16b24e8c52147b14b00 SHA-1: 9a50960d8dab9120d2b5b21df8331f29d1a2e40b SHA-256: 6b7ebc486b08418684b24056928ec42bcfca4b925aa07948cd0a9b77dfe130bb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting sites. This suggests the document is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://gtnet-engine.com/ckfinder/userfiles/files/tikazozoxewo.pdf In PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/33048579539.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d8539f028120b6feb707033f1a798190/69997639371.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/9421035418.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/87619bf450d3a4ff6389b1e005c0aa62/91533214907.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/38046817376.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/nosozizumavabarogubalagu.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/najitutadizaludokul.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/sebimerux.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/lejutizirabufigofawus.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/newuduvekugaxiweselojuv.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/kevidemasemedus.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/72069768168.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/94942215675.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/niwamegugela.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/xamawesaxuresa.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuropo.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d8d8efef44feeb010d0982d7ade26313/wosisatafafezogi.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/sojilafete.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/1a0f29868b0df0071174844d376d0681/70616957748.pdfIn PDF document text
    • http://com123.vn/uploads/file/2410856670.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/lenofanisefuxolux.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/85947075489.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/ludebidono.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/c8d7581157c6ac5e410f4a2feafc1c83/mewodu.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/kudifenom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+meaning+of+drawbackPDF 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_off0000cde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 10892 bytes
SHA-256: 1aeb464b5bdaeb255e5f8ba9605611fae2859351930bdd0b33f3039ce95eb4d0
font_02_sfnt_off0000feca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECA 17448 bytes
SHA-256: b03c6bdc1639aea38fa7273f9bd34eeb89df272052adb6c7c2e8a3e3a5c234b8
font_03_sfnt_off00012be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE5 6420 bytes
SHA-256: d469246583f65826fc5bf11f2eefb60de0e392828d18c90d5dab50ad3d56cb89

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