Malicious PDF — malware analysis report

Static analysis result for SHA-256 a897af05cf20af53…

MALICIOUS

PDF

86.3 KB Created: 2021-09-09 01:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9bcb020c34285d4bfec7aa8dbc291e4 SHA-1: 488627f683f6a708050a3d17a4c7a2cb3f287e4e SHA-256: a897af05cf20af5319aa34d767d97a7f02abf7ed9959327358d08f701baab36e
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document is designed to trick the user into installing unwanted software or extensions. The presence of numerous links to potentially compromised or disposable hosting sites further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://qtjdb.com/UploadFile/2021/09/04/file/20210904_163223_177.pdf In PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/93958685072.pdfIn PDF document text
    • http://unsersohn.ch/images/file/19529269581.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gqlvh0uuv446gs4esd59oilce7/70971424191.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/33972659314.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345ec2b326f---66203046606.pdfIn PDF document text
    • http://gr-chem.com/upload/files/xuxajoraledozupegekova.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/88317190908.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130443255875---49307743677.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/zopijuf.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/74486674840.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16133e38e82ba2---86251201363.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/purovamovewor.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/37618928635.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/kogaxaniritulibuzivuwalo.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/66310924907.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ujo3dk36si8ti66dorvv12hjlh/34559844025.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/92695449586.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/xonusevanebulinux.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/kojunusumitemo.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/pomuvilinuvon.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/sabifukup.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/palipumemejemosarik.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/v1tmbja0tc2li0it9mp9tnqf7b/kagideroz.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/dotorelegilifejek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=virtual+environment+python+3PDF 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_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 10772 bytes
SHA-256: f0c2b08dabaf244293d1fd97162be50fa246be4516e980f5d34a832a98ed3381
font_02_sfnt_off00011d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D86 17824 bytes
SHA-256: eb9ff69b5f8dd46f4c5e6064d8cbc5ccbb87818c73a2bd1f9439cd9fb089d713

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