Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19e3da648bf6f8c…

MALICIOUS

PDF

84.5 KB Created: 2021-09-21 12:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9108490210d2658ac80806044e4de345 SHA-1: 95bf513c44986749fffe706ba6e19bb6c7ed612e SHA-256: c19e3da648bf6f8ce2ae818ccb135422c86c99eb73808ff9e17d2e2e9382a5a8
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and link farms, some hosted on compromised WordPress sites, suggests a phishing or malware distribution attempt. The 'SE_DOWNLOAD_BUTTON' heuristic indicates a lure for users to click and download content, likely leading to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=the+tomorrow+war+123movies PDF link annotation
    • http://turksebruiloften.nl/userfiles/file/30317031026.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/subujewafalokozut.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/nafofuwodozixipibo.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/63789692025.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/19875092578.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/356554261.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/58866997977.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/kawikezilirizi.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/guvotewevunazedejuxinigor.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/48819187530.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313ef7b65fc---83703074787.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fm2gqq41ne2ka5nc4b23sm5dh/63157774699.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/rdhaaiegcqjr09pvvtnts7fa84/36829113925.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/4rbctkvmcieeq0rdas0akmuaa6/26658552632.pdfIn PDF document text
    • http://dkind.net/userData/board/file/33823064298.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/ziliwife.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/tudujajinopaj.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/12918475055.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/sidosox.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/nomexedo.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/27157239593.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/47016843930.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210912204336_1467648204.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/mobekebabepiz.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_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 10680 bytes
SHA-256: 14870e460dd364154e4ed9898dde00eae74e6262ffe877321301da004f086c0a
font_02_sfnt_off00011368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11368 18592 bytes
SHA-256: d4e505d078676f40cd195f95dcaa0c477c342065a1fa3285a0e6aeb29321b693

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