Malicious PDF — malware analysis report

Static analysis result for SHA-256 5118abb8162b803f…

MALICIOUS

PDF

70.9 KB Created: 2021-09-19 02:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab0df55a7c757a9b417acbcd772eb700 SHA-1: 06265df93b8d6da3ed3f191944db3ddecc37dbb6 SHA-256: 5118abb8162b803f0a6a3bf729cebf782cffd56142003a85cd6612770570a309
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URLs, many pointing to compromised CMS upload directories, suggesting a redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://wastran.ru/uplcv?utm_term=apps+for+mi+tv PDF link annotation
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e63784f5---seledipafupoxitem.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/87255901784.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/lereduxiwod.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/76886404240.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/14643970434.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/23754943916.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/bojozakufobejitigozet.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/12476390512.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/83700258260.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210902_044931.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/klbnpmgurqa3fab3nrlmq0bj3h/nukigegejovazuv.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/marusuninabesitega.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631114132.pdfIn PDF document text
    • http://ndt-ultratech.com/files/41004890523.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/disigumojivuva.pdfIn PDF document text
    • http://artospace.com/pics/file/firalepapeb.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/vubox.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614662bbea5ad---37455666913.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/89555811381.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/50028335500.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/95290286299.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/stri74sfbd0gr54t521mo44qaa/rasikexotejig.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/giditodogonisisaju.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090515502773499.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/16222013479.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_off0000b43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43C 16752 bytes
SHA-256: 787ed45f407f3b8efb6ea221a369b2bc7efd45f6f44a78b8c88fba8d842e101e
font_01_sfnt_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 10124 bytes
SHA-256: 8c4a4bdabaef2dfd529a9f3eddde6dbb4d50a0423d6295fecfd6b8b25da33fe1

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