Malicious PDF — malware analysis report

Static analysis result for SHA-256 845afe2221e15e7b…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 03:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4320da51a246c667dc36734066564f0 SHA-1: 2726790af1d2c2deef74ba0439a21793e755b49e SHA-256: 845afe2221e15e7b210906db9667a31ec6c347fc6e204e4c93db10d916e31024
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a tactic to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://baocaosudanang24h.com/uploads/image/files/tisane.pdf In PDF document text
    • https://girilawfirm.com/content_files/files/75039436737.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/057f3cb6cfc2ca92a8e7523c47567c0b/dademudugut.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/wujemodijabamimagodanofo.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/wujapozolipizakikivi.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/purumitulefaw.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/savujagavinawuzokexi.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/52199245183.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/simimaxonilixigosijifawuk.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/95675423005.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1759213f898207e11341585a7a393ee1/josuwag.pdfIn PDF document text
    • https://arenerachicamocha.sinecsas.com/ckfinder/userfiles/files/memubo.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/jusefupo.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/mivozevapegakikar.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/vobefiz.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/90673981494.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/gevifugigoweto.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/fewodakorujasavusaxojuli.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/59108922132.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/tefanonajixokizijapafag.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/41388210439.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/vanararutolug.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/doterilodobukagaxiluxe.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/63636581297.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/fbbb48cd2825227dd591fe365b7c034a/nutawewerelajadufiwopemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=apps+to+get+more+followers+on+instagram+for+freePDF 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_off0000b133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB133 10768 bytes
SHA-256: 71aff7f456fbe292d7de39dad5dd27165bc48e9c05a3e782e60c6b042b88dda9
font_01_sfnt_off0000ca11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA11 15072 bytes
SHA-256: a7f76a48d729ba3057d8d9e2e19f0c78cd9a7b18c29eaf6f6ed73c9bd8367128
font_02_sfnt_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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