Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56de4d6583fc952…

MALICIOUS

PDF

88.8 KB Created: 2021-07-31 09:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca5a419a5414e3b35e8424f7b4820507 SHA-1: 43a8cd16eb5b77d7ab93ba2576f2b4ff38569056 SHA-256: c56de4d6583fc9529d5e67be57d7c6719a67c2b968d4902aa6e1b309b149c4ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://coopmong.com/ckupload/files/76055769460.pdf In PDF document text
    • https://dodatnagarancija.com/userfiles/file/kositufisakajefuzineta.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/pazizixebonaxubupi.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/5859036266.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/vagutarisemexojap.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956390d837c---jokipovatefekonozorabajar.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/rozarija.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/namus.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/4tj7knev4fg6do1ntrokfihch8/witumoxisuviwusi.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/tjbi38tr32tajpv94ev5udbef0/subukigabikexipu.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/40871006330.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfc3dad460---86573332092.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/073a46i4rkfp431qu77qechhj6/28609380404.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/021a387b8707bb6c1b438424347f32f5/nusufutosasepiwibafevukis.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ct2nctrdleif1bp6e367nodej8/likepupinuxepe.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/82058532550.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6481b9c672---pijip.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/zafav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ad289317---zusovijibowugototakuj.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/36769224140.pdfIn PDF document text
    • http://xenangheli.vn/public/files/ridesuxopigekugokakoju.pdfIn PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/t9qve5r9ej4l6o8kt1dkcunb54/54880883596.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/np1t462110i02ts0oh28l2j0j7/zofulitosezagukiwewagidu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ju1huf170lbq5jjs4r9gr15occ/sagixivutamorubu.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c11872d9---budovebuzuvetosage.pdfIn PDF document text
    • https://loctra.net/userfiles/file/51259890043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=old+hindi+mp3+songs+collection+zip+files+free+download+pagalworldPDF link annotation
    • 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_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 17344 bytes
SHA-256: 19fbfc3016a1f2778b8fea4a3647e84e8f20e4276a94e529fc2a989a5fb88ac0
font_02_sfnt_off00013956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13956 11412 bytes
SHA-256: da4555ec8dbc69d0806254666667aea8387dc8a3d828bb30f966dac6a1629c1f