Malicious PDF — malware analysis report

Static analysis result for SHA-256 824a637be1fd6701…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 02:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 48c44dd4d4d6f9bef6cc84b08dbc4c7c SHA-1: 5dbc08f9361925a4accc7eb8b37e450ca397951e SHA-256: 824a637be1fd6701598dbe7a4b614a50df70937571c72618e5d8c8989aed7cb6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=process+of+preparing+effective+business+messages+pdf PDF link annotation
    • https://eamenfaraz.com/cache/fck_files/file/3952684509.pdfIn PDF document text
    • http://cga82.com/admin/File/fomufibe.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e34189ce7d9---domuxudusesexuwesodofexel.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/sisezag.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/50497816068.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/meresen.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/devakiwupe.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/68bsut9eatf18bp6ftl3efgf8s/dakorut.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/18577677005.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/39945316857.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/23f8a61c0e8bc9879419d1c481cc6939/67950164933.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/meet00t80ec7h4bnugthp7dj3s/lobexuxodobevofi.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/676ef5583907a41a049e31474b1bc887/xepuxit.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bbf0c1044---968730325.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c44f7b7651d---66103314840.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/82091250392.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/dbaad699ba4a88f60d68de99f8c7dbbb/wemininasonexageze.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/tujozumezozobotarokurig.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/31723570044.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/gm3ld3jcaq1b0qnsv3q8r4li52/94994929754.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/suruwerikekezij.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/tbucrsv70k487r7h2004f2mrvh/65763944086.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18e57d4a7---muwuzinaworiti.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/zebarovunevixabu.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_off0000d922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 16880 bytes
SHA-256: 507c02a5ff1b3abd3e4b0d033d8ee1efa1a7e00d0f6d38822afc1c5c80e99833
font_02_sfnt_off00011cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 11224 bytes
SHA-256: 4db80b71c3b0fcf04eee8b9dd9e1e1ee0896f843b45f4352b68ac63df784b707

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