Malicious PDF — malware analysis report

Static analysis result for SHA-256 9facec6c06cda28a…

MALICIOUS

PDF

78.9 KB Created: 2021-08-16 20:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f1d8935bafec76cf03b78a0cc457b294 SHA-1: 1cd70206a137d7a936ea26532bf7892ac1002528 SHA-256: 9facec6c06cda28a0982c6dc6cafa31bc0ae62e5b45c85ca21da42732c73fa0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous unknown PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://rjbmachinery.com/d/files/sujajivetemam.pdf In PDF document text
    • http://dolphinegypt.net/userfiles/file/59038412687.pdfIn PDF document text
    • http://usmleworkout.com/files/file/newobabedesakazon.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/zamiruxopoz.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/10477479409.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210624075441.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/33462243632.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/39502695426.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/logebelon.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/75341413569.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/3527c8ce8733365165f8626a6403fbdd/kugaderifuvusa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2fa54d80a---boridesukizorivokajovu.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/jawapoxesisefurinepat.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/a1o4cokd3tiondocnknv2g2d3o/35282712094.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/44361966621.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6169e13534---49262458815.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/mukasenepuzuwalujag.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/3acf0beae5712e9a8417972d32181617/23549649764.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/lezavinibosoxulisetowukuf.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/gipusedujag.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5a4088f7cf57545f22fc4ac828ed7001/44989929371.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/zezetoluloraroxiwuj.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210512085935_979574563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=petronas+twin+towers+case+study+pdfPDF 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_off0000d106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 16640 bytes
SHA-256: 02a0978bfe3a94ce0ff6b9c1159664de047c3785e573d0a56d6cd1392b017789
font_02_sfnt_off00011415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11415 10868 bytes
SHA-256: 8f82dc54e2959383a3ee7c191dc9677e925eeb3312f73e4f46b0fe38ed2d1a69

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