Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee3243e1751ccd8…

MALICIOUS

PDF

95.3 KB Created: 2021-09-19 10:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b64dda45570e34270b177179f0dc3b2 SHA-1: 3fcae702926da031bb6c97ba612a5a49b8be4fa2 SHA-256: cee3243e1751ccd8a5cee146e23e0e0bc0fbe246a0672a07cf4111a4f03a3b9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the links and the detection results point towards a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/r4m8iqfm1pdtaoco4c95k4smv2/24662914106.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144442bd5a4e---loxegolisojawifobi.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/pugaxipiligixufitep.pdf
    • http://nbnjl.com/userfiles/files/vibobatefadonuru.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5djua69lket34bdqhp44g30ac3/pelexiluzumoterowimudizo.pdf
    • https://myvideoclasses.com/ci/userfiles/files/fizinexenemojojafe.pdf
    • http://lideparts.com/userfiles/file/1631495132.pdf
    • https://machnik.net/ckfinder/userfiles/files/rurafelitib.pdf
    • http://mcdanielz.eu/files/file/89847306783.pdf
    • https://salwangurugram.com/files/3441160819.pdf
    • http://bright-mineral.com/uploadfile/file/2021090918024859.pdf
    • http://abcgsgeds.friendship-match.com/upload/files/xesiparukilibemosofo.pdf
    • http://p-itos.net/admin/userfile/image/file/58684059744.pdf
    • http://www.vljainandco.com/userfiles/files/47644411415.pdf
    • http://www.elstar.ru/uploads/files/90081930832.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/1b6b395670c55fdf22080c491ed63402/83194282722.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/21247295479.pdf
    • http://thegioioto.store/upload/files/84124294455.pdf
    • http://sz-nuoyi.com/Upload/file/2021090206542847067.pdf
    • http://futuralagoparking.eu/userfiles/files/30133579002.pdf
    • http://fjzy18.com/image/uload/files/pemiravo.pdf
    • http://catwalkexotique.com/userfiles/pixurexukesude.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15bb20aeb---25857845122.pdf
    • http://erpos.sk/data/files/kubuwuzegok.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=game+of+thrones+season+8+episode+3+123movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ad4.bin
1c9563a79fd64ce9566adcb7acea636a7f00a859471c561e2c65aaa0a55f97f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 19192 bytes
font_01_sfnt_off00013cbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBB 16792 bytes
font_02_sfnt_off000154d2.bin
11ee71b9fc1e2ee2a8f8cbd24f043d335635dc42ed6b7df9d0a179f876b9f32f
pdf-font-stream PDF embedded font (sfnt) at offset 0x154D2 11372 bytes