Malicious PDF — malware analysis report

Static analysis result for SHA-256 aace5272b5364d5b…

MALICIOUS

PDF

71.3 KB Created: 2021-09-19 05:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b40cd7431b8d0e1787db75f420904bd6 SHA-1: 45f95405fe57cdc63d7ace29af58712f6d53b19b SHA-256: aace5272b5364d5b1b97d3053d55f60b5c4e470d3ca8f01d46d13225871174b6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is intended. The document body is unreadable, but the heuristic firings and URL analysis confirm the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=android+vector+drawable+example PDF link annotation
    • http://monticellotownship.org/userfiles/file/zifavaxiv.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/43450155343.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/68119447553.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614663477c0ea---80972133499.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/sexebebifozazatavojagasib.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/83427997445.pdfIn PDF document text
    • http://enricobarraco.com/files/24650924775.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210901020747.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/12859099929.pdfIn PDF document text
    • http://all-premium.com/user_file/files/nugatikegobowemiselikaxok.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134173853285---tokelun.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2d5c2d8b1---gopeb.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/86360592675.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/46848255671.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/14048209334.pdfIn PDF document text
    • https://netpage.info/userfiles/file/dogixidanurakirarepisopi.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/221585396.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109150409353516.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/riwuxakiruvunumomipa.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/rolod.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/99025a16d3a99293e4f70bd77cfe7905/fuvonekasebafajaxokiliva.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/febupewuzukaka.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/tipob.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea87d0101f---5695863810.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_off0000b710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF22 15332 bytes
SHA-256: 0d66419a61c2a7176f5d0e082b545d6acf46f7d67c429b161495410a33ec8f24
font_02_sfnt_off0000f62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 10880 bytes
SHA-256: 1c0fdf64fe36428b38afa426a7f0ab718ce21c5601bc00a8d9ad5ebdf6f004e1

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