Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff7c0cf049714b5…

MALICIOUS

PDF

74.9 KB Created: 2021-09-17 11:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98029991def670fa0120d7bac18389fe SHA-1: 7feb1ed40f42cca993dd4a1d491faa95945c982f SHA-256: bff7c0cf049714b5743b40236dfade560afabba0feb41b69dc4aaa47ed4aff22
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious or compromised sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://change4best.ru/upload/file/pelig.pdf In PDF document text
    • http://nhatnguyen.vn/media/ftp/file/milixirixigixeronomap.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/39278297081.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/jofivolodijomuximoxana.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/xetujaw.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/xibini.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf2978266c---803889159.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/karegasokukotisokovixor.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/7c4c1daec615e14f5359b0ddc0345361/84557523751.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/84617383792.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210914022528.pdfIn PDF document text
    • https://langumeistras.lt/i/File/56631113050.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/sukiwitexodusalorojepobab.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136310ea305b---54167934701.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/19647775762.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/mufodapelipuseronarano.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/88808394831.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/23234057110.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/boralajemewela.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/66880580649.pdfIn PDF document text
    • http://farashimirooz.com/files/56499003343.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d85460bc9f---60812541361.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/koperizemaz.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/62331090040.pdfIn PDF document text
    • http://turatabor.hu/media/81258264863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=snapdragon+888+issuesPDF 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_off0000c08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08C 17128 bytes
SHA-256: c428e84809dbdd12f2122c1cb63e6efdb747510cbdfe5037bddc2eb301e97414
font_01_sfnt_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 10804 bytes
SHA-256: 7233d06dc3d2624e15808e059ed49a81b6a823680c3ed5ba4251c0c240e49220
font_02_sfnt_off000105f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1