Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebaa0c77f174799f…

MALICIOUS

PDF

75.9 KB Created: 2021-09-18 17:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e023ec653758143303588bef981f448 SHA-1: d130e6ab467bd35e7d57478c867d616255f9d755 SHA-256: ebaa0c77f174799f90d36998469c8bc9b6403e8ab9d6e7946245698866ed9e7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=magnificent+seven+torrent+magnet PDF link annotation
    • http://avanti.pl/userfiles/file/godalivuguzagafujegejo.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/oi26mo7gqakn7j8hva8fe5rk46/93558878250.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-8/20210908045753211208.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/gunowujanopumurabiwugufan.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302fc3192bf---80951381470.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161411ff66f327---miturutasivelef.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/l8d7g21971o4vico7g2srmhth4/nefokugipunaguferuxinis.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130197c784b8---99618095268.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/25307261208.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/59911447824.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/majofan.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/68543785647.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/15769362780.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/xifefevatev.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613983aa95e03---46141083305.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/memare.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/60946195241.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/vofojine.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/rakajebe.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/jodirezu.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/11928409054.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/30983352377.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/93265294702.pdfIn PDF document text
    • 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_off0000c371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 10692 bytes
SHA-256: cc276876969e6a8336b1ceac687195bb7ec4dcaa459370c04eb06250e045b749
font_02_sfnt_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 17632 bytes
SHA-256: 3d528f6805d429938bf94896de0a39d3ab3351803cad029352882c7a3e462217

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