Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ba090afdec3659…

MALICIOUS

PDF

85.4 KB Created: 2021-09-13 11:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a8df5baf5367fc97e202f07a2a9c8f5 SHA-1: 810872036c0d0003fff0d5f3b5f15ac339908757 SHA-256: c0ba090afdec365979712c3cca464c152c65cfb95a21c360e33def0a43bdc64f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites via a link farm. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document, potentially for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://premiumcsp.com/uploads/files/13537839696.pdf In PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/juzanunuvegaw.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/vatapelarazawoluzalere.pdfIn PDF document text
    • https://seikai.jp/free_images/files/galapiz.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210908021950.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/xoposomubevi.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/58261905656.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/fawoz.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/sejuzaxizubotokidigebepum.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/47841880731.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/koxisesow.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090804301756425.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16130afe35c5f8---ruropamaxiluzovirep.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/38388498013.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/86a32572b481185168691729de59f48e/tamebafokumisebufikiw.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddaea3b2bd---zipebuwukofevenorukuro.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c12f30e090---bezupabaxunulimuludutep.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/692508257.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/8271641997.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/pimajifuvi.pdfIn PDF document text
    • http://eichler-kammerer.de/rizaxexonabef.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a405640b8ae4b4a069ad61a7b336ba58/44766457306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=overlay+pictures+app+androidPDF 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_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 10812 bytes
SHA-256: a36833e1385fca6f79c7cef8c361c1ab0a914098dc8d1bdd65cb37037e939fd2
font_01_sfnt_off000104a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBB 16672 bytes
SHA-256: fb8e30d7e8acf043f68a4765cfa423ff02afb735a57ea0530e10e24ab432a345

Open this report in the interactive analyzer, or submit your own file for analysis.