Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fa2ad72e79b2b1…

MALICIOUS

PDF

89.0 KB Created: 2021-09-20 00:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca80c4d438175f1b5ee3e3612fc327ec SHA-1: 79865210d045555d458f5e179cf347771af9efc6 SHA-256: 57fa2ad72e79b2b133530ca4138d5f70eeff74e31684c91f8153104f33b5b611
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely leveraging a compromised CMS upload to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613522341edc4---gotoz.pdf In PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/mikonenijudutukiw.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/31699426645.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/wexiwofidekiwug.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ecad80544---53026263635.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/duxotez.pdfIn PDF document text
    • http://biosite.ru/images/news/file/90265456402.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/julig.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139239ec6795---mewowisufi.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/91815816834.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qkack4q10jn4n976fe7h7l67ku/porixibutixuwebemadeka.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/78385860189.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/xopane.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/nuwojekuvaziju.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e5f7e07e1---31157635192.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/zexuwegavifoxafaku.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/020c2538e8b5cd2c1786b7b1fdc7a40f/70329620438.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/60954339004.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/76812196322.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/55214058707.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/mibajowobusidotetevimusik.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/tabojexejuzoxebojofigoka.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/sebusesedaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=install+android+tv+launcherPDF 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_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 10584 bytes
SHA-256: 31d633fc746b364bc6aac56e86c04d47496c277bc0ada983e2871ca6420c5ed6
font_02_sfnt_off000128a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A7 17456 bytes
SHA-256: a830c5289d4487e655cf0a98ceab110625d61a3966b880c48de6f27aa75b8d0e

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