Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84f1ddbe856b311…

MALICIOUS

PDF

128.0 KB Created: 2021-09-20 06:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61ef4b7369b4415e7b258dce521af0c2 SHA-1: a99de4c5b364d8c73263cc0254ff1b157ec2111e SHA-256: c84f1ddbe856b3119f5f6d01c14ab1c2d539111dbb8a9f61571bd9b4ea333930
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which appear to be compromised. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a URL with 'utm_term' suggest an attempt to manipulate search engine results or lure users with specific search terms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=minecraft+pocket+edition+1.8+apk PDF link annotation
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/88325216172.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fd09d9bd9---19439850149.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/9667628859.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/60427643320.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/jitazan.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce3770b350---29108410795.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/gabifizofilinuxaranirale.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/50365423486.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/kanutalokogumuwewemifada.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/bilaxowelajesizanorijawa.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/vemevibafowutikirilokawi.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/wurovidobivokizarijidemo.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/riluwuligi.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/rejisojidoxozoti.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021092002242673499.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ilf5almjsg0gs0pg2meihkrqe6/vilufiwigipozerogag.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/wemusuwut.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/tupozusosekiwowizexur.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/pamubepisemabumukas.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/36081334555.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161412c1b1a8e1---12179784122.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/rewirudimexozazozojowuwe.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/3ef2bbcf2131aae0b1db8e814bfd779e/28922274514.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/webisuxa.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/47095525257.pdfIn PDF document text
    • 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_off000189e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189E5 20904 bytes
SHA-256: c4673dffcc68e5c9a94e6cdaca9fef0af9e71bccac3ed2192d3c6737093f530b
font_01_sfnt_off0001c10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C10A 10812 bytes
SHA-256: 327aa3b04b93afb257ae4ae6d70d385d30251c8fd51b4cb29e477cd90754afb7
font_02_sfnt_off0001da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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