Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba25a2af70470503…

MALICIOUS

PDF

96.8 KB Created: 2021-09-09 01:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a3929177b17c6fcdc47d4735d766871 SHA-1: 2b2b839bf86ba4251ddddf974a62305617227ae2 SHA-256: ba25a2af70470503b9c96021a7bdf92888b35f9037a5f841ae0967bfdc9d1862
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and other domains. These links likely lead to phishing pages or further malware downloads, aligning with the characteristics of a malicious PDF used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/3a81786125b3e17cb0128ebd6e129dad/48018151526.pdf In PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210901_C323A0B22EC69A59.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/a32dd0b342cb4a133e2a688791b2f4ac/57968930053.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/ritabikifujazufupufokox.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/64684387311.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/38587274041.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/86797418331.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/lolatatuzuwejefojivil.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/zokowapune.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613142c66fb6c---31873321239.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/25dab7c7edd1cc3b211059beca3c2482/niwegituxadof.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161393743449d8---vukinunuk.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/82210934814.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/64336043885.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/towanug.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/jaxupilimelajusane.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/fekorelujofikikodawamego.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138402cca8b9---jalipo.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/7b6502bf891c08e37716b4f65f21cca5/wusale.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55899386820.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/8q67h2kaq3tpc65jphueoft1ga/vegubed.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/87570038827.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/99688795229.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134062e13232---31206335922.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/2161938652.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/wosenir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=idle+sports+cityPDF 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_off000112db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DB 10308 bytes
SHA-256: d9f00ee1db4b6c7d9cc3b77e0c5b8569d749dc44cb484d64ac1b556782ab6611
font_01_sfnt_off00012a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2B 19536 bytes
SHA-256: 63f5032461671c0de470e28e57eabce6cf9398be75fc92ad83b610a46db9f55e
font_02_sfnt_off00015da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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