Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c68fb896d405cf3…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 01:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 18e4c80012921bd12ce47e51e6e08a38 SHA-1: 09ef1410a6d44d74f2d74210c11eb4e7b43d33be SHA-256: 9c68fb896d405cf3bf200428ea4f533715d69948029f01426ce3ba061a88e813
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable domains, indicating a likely phishing or spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The presence of embedded JavaScript (T1059.007) is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://baloneacessorios.com/_upload/file///35033077822.pdf In PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/815083131.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/37788321470.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/38546568360.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/f2aa82ju1m6fvhrdm4svdkodp9/87581657535.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411094e3616---14004659444.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/70947800998.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091812343432.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9377ad70a---71022838654.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/25846286108.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/gudedesavemivojilam.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/jobonawolabeju.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/94649059462.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/84061904358.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/bopenodusipuwukexuv.pdfIn PDF document text
    • https://tekartltd.com/upload/files/39483749426.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/53817435773.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/gowefum.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/91212548025.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/96433915389.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/pivibulab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+mobile+software+for+pcPDF 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_off0000e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 17928 bytes
SHA-256: b9d3ff8d8528a6578a43cb12a14fc1743f23891cbaed7dbab69edbcb0b5b75e2
font_01_sfnt_off00010f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12751 10988 bytes
SHA-256: 0c8ed1b6a1dddc93d35693e5a0fca1dcb69a4673b4b4d14e1ebbdc4ac80f448a