Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8919f6fb3c7f55…

MALICIOUS

PDF

80.9 KB Created: 2021-10-05 06:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b94ab75284e6ae270d62d7c660a9ab18 SHA-1: 212f74cdf3533edf11ed6e2ced94614b1bd99550 SHA-256: ea8919f6fb3c7f5555a1d5c8afbacec5beda6ffa91bca21d7ba728821b24db75
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns point to a common tactic of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lex.tj/img/file/varelatugigopuboxok.pdf In PDF document text
    • http://degrossier.nl/uploads/file/satijugorumumijo.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/tesejonizika.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb8d1f3d8b---51483737070.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/wijorase.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109181205014976.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0da939bd0---devijazesiliza.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16154095650d42---lapafaf.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/jolarugikegolifap.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/32032208439.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210916_680B25575C91FBC7.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/66019532744.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/37171934064.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/zirevixodan.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-26-03-59-56-20.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614c95542a8ce---23844297130.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///92287064683.pdfIn PDF document text
    • http://ciatic.saintelserver.com/archivos_editor/file/xokewikizawibinufe.pdfIn PDF document text
    • https://tsegypt.com/file/ravisupobexusozonufigewi.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/pegumavizixevo.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/bobefaj.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/57225634626.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/fatugimufixivemubiba.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/38605501636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=summarize+articles+for+mePDF 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_off0000d87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 10628 bytes
SHA-256: 4fc8ddaf1feab05a706050c402cb9344f7359519f97dc947ba93e72705d306f4
font_02_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 17524 bytes
SHA-256: eed1cffd41eddf7d947cc1e910158a785e696a8cb1044b11b903010b621e6bda

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