Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2c87db1e8667cb…

MALICIOUS

PDF

88.5 KB Created: 2021-09-06 01:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7aec8f3b5315f775bca26214640df93f SHA-1: 5d5d772228a017f5b7d43eba7c175aebec8f263d SHA-256: da2c87db1e8667cb823ed610512c784014e758db94dba373652cb7e57fb77d29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised CMS uploads. The presence of these links suggests the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=euphorbia+helioscopia+pdf PDF link annotation
    • http://renovfab-menuiserie.com/userfiles/file/25020739357.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/bvr6d2e5q0nio49hot9je0vle5/92628717918.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608093a8b5e2d---1221613862.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/11376626580.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074c6fd1178b---lifugapu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/29b68df2777bea58dc440d6b0f5ca45a/bulipunokapoduxi.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/15765714715.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/90453f9d283f2ea11b01557fb3cc9438/49487640044.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/98825288394.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/09e0147edf3a6658639014095d8af9f7/darugonujeluwuwanotejuvur.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806779e0a5d---74942678233.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728c702b33e---82940702539.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f58ce9174d7---mawesigubiluvogat.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210622_AEDB1699AE1BE4AA.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pukumolugo.pdfIn PDF document text
    • http://ciskmv.com/css/file/442360538.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9be356b99b9d464cab77b0c31fb6992b/38288350266.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/xogigu.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/porajov.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/fijinibofasoginijuzopusi.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/12487854454.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/2209921501.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/dapedixupireziw.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/76282967144.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_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 21572 bytes
SHA-256: bf31f5b73b13a02d114f474b3a6b37723b6bb5a3790e4f0a2a1fe7d4b66e3154
font_01_sfnt_off00012378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12378 10736 bytes
SHA-256: a8ce42af10f18d99ea142bd2665eb7c5de9b45ea2d690928752978159c3eb10f
font_02_sfnt_off00013bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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