Malicious PDF — malware analysis report

Static analysis result for SHA-256 720da5d324c852fd…

MALICIOUS

PDF

88.3 KB Created: 2021-09-07 08:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e1185d38da52216c3bab8961582c115 SHA-1: b57a1edb8e9dfbc02b48e4ef7687e650b1e5ec39 SHA-256: 720da5d324c852fd0f4c1b9acc1d942d3fb78f92f5dba32cb18cbd3560a83df6
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 WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=les+maladies+mentales+de+l%27adulte+pdf PDF link annotation
    • http://zulassung4you.de/bilder/file/punibuvulofineginu.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/78273136184.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613008773e20d---23117925273.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/varerepobukopidabemo.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/ec4e5a9d57753b100d72e9933024fe0b/vemibifojisux.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/73218301070.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/034b9ca785d609dc0d546e7695cbd54b/53641552336.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/wopapuripuwunog.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/48177659632.pdfIn PDF document text
    • http://vodova51-53.cz/files/71229016011.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/nupuz.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/26d985c191fdde6b56c9af5ee81656f5/mutukujujininidegepawet.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/13772bc3a8739b842dc5de4e3909b38d/84459413102.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a48478c5a---9139525376.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7d5183542---refabapaxagof.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096f934d26c6---27297663711.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/2e029ffaoetjtskocq834kjc42/80015662040.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/motagafebigezo.pdfIn PDF document text
    • http://protok.pro/upload/files/pebine.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/lefuxujonaxitika.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4748a8886dd1d4cbc1bed3d6392ebfaa/68224332387.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c79409fbf4---jexivoruzevojelaboweloze.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/visoxegebiliwaligube.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/88390766171.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddea9797d6---71352617190.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/96643b122c01189037a769851dde0e80/fomupuforitoxuzalodidep.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_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 10532 bytes
SHA-256: af56d40e17371b30d33035db0bfd772ec6e36ef03c0ee55dbbea781cccbbd0b4
font_01_sfnt_off000107e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 20040 bytes
SHA-256: b2e5315ab62a692f22b851d5a9e2c64d924c6379a32035f986dbeaba0e8917a3