Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6db6545f35c4df…

MALICIOUS

PDF

72.5 KB Created: 2021-09-12 21:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f4d5c5888477201d69f020ee9835faa6 SHA-1: 1b4dbd39ed6956d62ac2b26ebfc6544a081bf52b SHA-256: ff6db6545f35c4df4ee8c730db4abe9a3a4fff6e2d5118de18266d86bef16e6e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as Pdf.Phishing.Trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://weekendtripskolkata.com/userfiles/file/pilarefadedikidewajodok.pdf In PDF document text
    • https://kiofruits.com/admin/uploads/files/42141435060.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/95148542994.pdfIn PDF document text
    • http://dhf-china.com/d/files/46511220521.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/kuwusajomulosefamiwegawax.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304c35e83e0---jozabevotivemotel.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/wijelizulelotajawaru.pdfIn PDF document text
    • http://nenorm.com/files/files/25166109989.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/4044052437.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc43b69c9a---netuvajotureriredekopo.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/66334366999.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/15071644419.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/52306550698.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/77807180417.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/tajafibigil.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/628536584.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/14360972066.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/fevizex.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/67985514128.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130000cab04a---37906802720.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/viguve.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/weselevupuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=tom+and+jerry+and+the+magic+ringPDF 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_off0000b9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F1 10808 bytes
SHA-256: 285360eed8d7f35b6e4b9b0d91d02fbff36b97dc9d562cf4b98d4946807baaae
font_01_sfnt_off0000d272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 16460 bytes
SHA-256: 6c17b1ad949d59583977d6849d7f698425d28ec9e0aa9f2c1ed3a3b00e43da90
font_02_sfnt_off0000fc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1