Malicious PDF — malware analysis report

Static analysis result for SHA-256 f988b2820e3b9c4c…

MALICIOUS

PDF

77.4 KB Created: 2021-09-10 06:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5aafdf14d6744c52ea3c9f678e1438d7 SHA-1: b39f5f31876e34c1e49e6ab53b89a89bdb575d16 SHA-256: f988b2820e3b9c4ca2d951605c3ce1081546bc02060f67bbffa2e455543da929
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be part of a link farm hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=html+email+clickable PDF link annotation
    • http://brette-animation.com/userfiles/file/binadevedejise.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/80986225675.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/xamibixoxowagokovo.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/63739253319.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319f6c8551b---buletun.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/rokeminipizukowusaxodizef.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/71546857700.pdfIn PDF document text
    • http://cobmedia.hu/include/vemap.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ee88d3287606f468160f3047cac10b07/wazoferuxunekexumodigawa.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613219903b9e9---kojoxazezaripuzufodo.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/jobuvopeporu.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/vokijupasopejude.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613924fc3261f---37926178124.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/rupafexajobaluminuwizese.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/mijabowanigidu.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/dipijetopud.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/69240250589.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/98857035887.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/he2gmtt5t1a6qrvolutprct4h0/sezuzikubiberejavebanezo.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/41448378383.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/96940859393.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210901134619.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/80771567564.pdfIn PDF document text
    • http://metapolar.hu/tmp/jowazefomowuluxupokasowij.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae8f64e96---17617766171.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_off0000cc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1A 10124 bytes
SHA-256: 2905fb5f1600b852de0f5105993dd4c86be056529b4306dfff0eff0eb5cdcdf2
font_01_sfnt_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 17564 bytes
SHA-256: 62df56d6dfd5702755384f4397cf3c8592d49ae4686a9a6a76b257b869708246
font_02_sfnt_off00010fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.