Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ae48535d01e326…

MALICIOUS

PDF

108.1 KB Created: 2021-09-07 12:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 618894a116cb8ac1b743253c85589c1b SHA-1: 77ebe889461a2be2c5ab916e25d26296ee185c50 SHA-256: 55ae48535d01e326f7fb42cb365ca812e9739d9b17836a1c2771ee8362a090e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bociany.sk/media/file/figufuguxe.pdf In PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5fa66fb1515642a9e83ffa6c5f5bd00e/fijusewuf.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1fadea4594d70709239ca56225a0c9e4/futimisug.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2agmoa7eb59rumr3q5andj7501/magesozujebifoba.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb2823d00a---ruguralunekiwaxobuw.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/2065272014.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/61739432852.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/38284246192.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/90666012191.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e92a219fd---vawudavikadikoze.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/sagaxerilatoruzumibenem.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafbfb5bbf2---60415251018.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160db72e82c1cf---luvesuzijebugalikebuzog.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/89648602367.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741957c870b---kanalonivumapefa.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/gezutofaxusora.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c632c92d597---gonuwolijodokulubu.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/67526671198.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/lomesobubopuworeju.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985fe4cc204---rujosi.pdfIn PDF document text
    • https://grnca.org/img/files/files/ripajefirenera.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/40525957a0878351191a82925c8980a2/wupuwalabega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cricket+world+cup+2019+schedule+pdfPDF 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_off00014101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14101 18252 bytes
SHA-256: 8915dc4bd92648de55e5d50bbc67777c9ff0456682c9bcecb082cbe12a6ac827
font_01_sfnt_off00016ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FF7 11224 bytes
SHA-256: 2efa16e183d8a750e3e3477befc491eecf5aef8f6f7e00e17080c18e302c8167
font_02_sfnt_off00018a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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