Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfe4a06feb19949…

MALICIOUS

PDF

70.8 KB Created: 2021-09-03 18:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 75e38dd4408328ebb4b289c8b7a0f916 SHA-1: 83483feff2e723916679a30c98f281787a3238a5 SHA-256: 6dfe4a06feb19949e9928853a74c8eada220160e0c11602bbd07b9daead93ad2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=carrabba%27s+italian+grill+menu+pdf PDF link annotation
    • http://ferramentabelleggia.it/public/file/48351156192.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/28384933920.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/86602045702.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fef58ab88a---jiwumiwijisipobazamajux.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/kujaredu.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/5350713566.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/21874009171.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b2933452e---tapuluzutogemuj.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dff1964b95---zefurifir.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/42603685123.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/41519691801.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/xezal.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/32482732807.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/lelavure.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bcbf8a821---webegatebesad.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3f94hma253qm3e125uqtudbue2/59917190178.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/15738918708.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/76208035457.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/togebokibubafezezudi.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9fb20c646---72793316122.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ohbvshv97pd7sram8gjcn3mp01/tufofitilajevali.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/dedewazifeloxurak.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_off0000b6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC4 14796 bytes
SHA-256: 6ea21b960da12271f9bc37e06ddd9753536f0f64ce617c88b358198ae457b0af
font_02_sfnt_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 11024 bytes
SHA-256: 6b905e905a59478901bc219609c8b1b46f4dd3940a2a7b6c8181094f3df7059e

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