Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba479dea23a42aa8…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 14:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 751dd6b58315ffab7b11de1bff2c0d81 SHA-1: cfcae1430b9f260e04b9a290bd2fc6840183c1ad SHA-256: ba479dea23a42aa8b1c6cbb3e54ad8f31f819a44cf9b2c4ea4ec16a2d3ad115d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613651bd2c302---fisalepovetal.pdf In PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/mubugurifig.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/65895365312.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/fesisetubezatiradoviluj.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/vakoted.pdfIn PDF document text
    • http://honghuibio.com/d/files/rigupesixel.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/22021843477.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109060550466507.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/desudagotaju.pdfIn PDF document text
    • https://mihalex.by/files/files/jigurinu.pdfIn PDF document text
    • http://www.bash.cl/media/file/wasolub.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/bibalulufixumidunek.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/vokadesoro.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/gafonaxij.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/katapu.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/79227944298.pdfIn PDF document text
    • http://koutingchina.com/upload/files/tuwovarefixag.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/3551601016.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/visubowumewomexarikuse.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///muvinofaloxuxofifoga.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/dipawidifuj.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/68794643578.pdfIn PDF document text
    • https://mfdesign.hu/files/file/29943422528.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/zijolokaliroxusitatupaso.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161349b55814ae---82827806488.pdfIn PDF document text
    • http://ipublicity.cz/data/file/52173290744.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5c549bad3---16652376848.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210910065924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=quick+text+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_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 10500 bytes
SHA-256: b7d003280fbc0bedb645a8b87771fa49f48e64943fbbbe710b72d611fa1dba88
font_01_sfnt_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 17856 bytes
SHA-256: 0334f621944ae584a3ba9e49cf6186ea9a6b827199d487286facb74fd62274b5

Open this report in the interactive analyzer, or submit your own file for analysis.