Malicious PDF — malware analysis report

Static analysis result for SHA-256 eebba21dddf88897…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 23:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30d3d49aca4a1b53525f769ff22f49d6 SHA-1: 900105e010ecd6aca275ff898b77bad90307f545 SHA-256: eebba21dddf88897d74e84b1e563d777393e8e95a36c7a5b17453df4196ddfa1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The 'utm_term=download+clash+of+clans+mod+android' parameter in one URL suggests a lure for potentially unwanted software or phishing. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pianotuningdarwin.com/userfiles/files/redojedanurodeges.pdf In PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/59577200927.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/66066675690.pdfIn PDF document text
    • http://taociren.com/upload/file/21090100255355887728az5315sk45.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/64796443915.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/98062723929.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312b9de54c1---jugapejasubaxibigofuluj.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/moketofuxam.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f00d8165d1---6990295862.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/88381381973.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/dudipivukobanugezudol.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/tibedojapewuvatawimuf.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/fafizijula.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/90369642084.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/14757769376.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383d7cc3955---pomizixawuw.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/fuzujikonivef.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/domujolizudesamo.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/dokotanipagilisimenib.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/sufosasofizitirakud.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/kesebovipufujebigozipuvu.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/jenifurexudobalubexisit.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/37200560699.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161367d53d4f8e---51892891447.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161368cb53939a---68927903163.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ao559vab140ednjlbfmdmen4rl/nezesefuragekakobowuz.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/2237067824.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/73708285894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+clash+of+clans+mod+androidPDF 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_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85F 21260 bytes
SHA-256: e8b0a93b821b3e9c526dbf5244f3d0e0f74d01020721459f7d834e6c019b149e
font_02_sfnt_off00013009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13009 10600 bytes
SHA-256: 779adeba325b80d5ff33f900d8176f2734c2c9ccadc7056168c93484e4a465b4

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