Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7dc2d5a1dd92bdd…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 14:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 912e0717a179a75f3f0b5dbc3ec77e23 SHA-1: e7f911e179fe9c224e2b4f83a4706d85997f426d SHA-256: b7dc2d5a1dd92bdd2d23465bafcf37a582a98cbf9591c0c619e10cb6ce80902a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the ultimate destination. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=raycon+e50+manual PDF link annotation
    • http://hilimall.ae/uploads/files/38319278016.pdfIn PDF document text
    • https://telenovella-bg.com/files/dazivanituduwid.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/99fdab57e1403a911f4123a1ab7ce309/14419076556.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099237bbcc44---tebuveziwigezoke.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/q3reqtt22o3lfp1hkaico8fol6/79322645445.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///65605119902.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/38774965509.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/motomipoxirot.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9810cea12b---fubolake.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/benafedigukixixudag.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/padigejaxina.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/vivutenezenolikufo.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/36984297636.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e42da653a1---24880275282.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/sadel.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d5e4bc1aa---juwapiwitowuwepa.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607da829b4870---31856467915.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/92506988565.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/5177965342.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e9a32a5d2---bepuvajedatexidenesi.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/o3l3n7gnmipc1ad5gp53j4rojv/jukotosize.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/a9a906267d1b5a6d1bba8c2d2fcca07f/25705107311.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/fusipujusi.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_off0000d140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 10448 bytes
SHA-256: 34438e964c4f5dc1943e1de41fe81c654e9dc1c5533f7b97d6536072a03ad597
font_02_sfnt_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 17172 bytes
SHA-256: a28ffec01430488280c89d8620faad8f9e763e40dd88db791fc4399c1f8467d5