Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca17427c4f928ea…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 22:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a81597b22cba860f18f4317efbd27b6a SHA-1: 259564af99660324fa639501eb0403652a18f9e6 SHA-256: 8ca17427c4f928eab2e110b4abacaedd23750ee5529bbd69317b0eacc11161db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or compromised sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086053be880a---ruxukokegoxoxizunefe.pdf In PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/85245788306.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/mukexavuk.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bbomdr771c5fim4ifv47bkkti2/niviz.pdfIn PDF document text
    • http://donghotam.com/luutru/files/38672613547.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/gobiwijenek.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/kejazudikodagikipin.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/90d47750809449006f7902f157cfa4af/renujituzedi.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/29934391275.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/cc1d29535ae2d20f6182fccce504f38f/70210502779.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/105604203.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/usafg2jrq94qo5sg8s6ak2i5b1/gizepawijewisinafeperon.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/59375209629.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/110386166561294a05e2f09.pdfIn PDF document text
    • http://chieucoingason.vn/files/65807936882.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f6d2c821980a90c0c889ebfdff59ff09/kudofapufoxozepuzinodex.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/xujelazoralobegani.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/32761169594.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609249e2d66e5---tubofumo.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/35399508181.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5a81ae6d7b262010c4f839af26d386a7/feroxopesegasobebogega.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/ace8363366bb851bd7c14381ad1d86ba/47896982808.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160736f3e2bf18---93674321744.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/08841a4cd009ab4417283dbb472e2fbb/wuzokinazabakevadubuta.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1de242041993f1a3e9bf3671db65ebfb/405611808.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160911256200a7---72431963152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=railway+medical+manual+chapter+5PDF 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_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 18748 bytes
SHA-256: 1e2461195469bb1967f2b5630ea802b92cb327655058571d675b2219c063017b
font_02_sfnt_off00012af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF5 10968 bytes
SHA-256: 7fd0d9fbfa6420476d13c6cc22b83e80f21a87e70ca0fa0cfcc3bfad19e931db

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