Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca468589bc82726d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-22 18:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c193ebe357ace88ce00391b151a6b0e2 SHA-1: ecf3aa29fbf239d6deae4abc2891b0a429b600fd SHA-256: ca468589bc82726dc61a1924f0d2efd51ab9a7c0982215515828f7f7f4ad2823
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=gold+run+mod PDF link annotation
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161488d64e27b6---77768490803.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/19721965312.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/vekagokivipozekutixiriv.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/86355373283.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/75922546882.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/24717627672.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/satijugorumumijo.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/xawas.pdfIn PDF document text
    • http://ave-france.com/pics/files/regiki.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/kanofuwimuwomepej.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136113c3d0e9---mujefi.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/2006057834.pdfIn PDF document text
    • http://acelybio.com/upload/files/69070045742.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161463d363c1f9---mezorasinebujamosikajel.pdfIn PDF document text
    • http://email-database.info/userfiles/file/wagiluzopaj.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-9/20210909010030363029.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/9111079311.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/231625642.pdfIn PDF document text
    • https://plasy.com/uploads/file/pojiniliran.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613294f6cd3bc---giwubexowoxowunu.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/96150189051.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/4231188411.pdfIn PDF document text
    • https://akvaguru.hu/user/file/migejelivagumuluwawu.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_off0000d782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 17052 bytes
SHA-256: c9be75625bbeaad9e2d3e9afa75e2ec2e11d95c4fcbce6068c2858417fefc2f2
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 9896 bytes
SHA-256: bd04f3697f992f9c777a5c32c74cde3efdcf5daa2a2d67af8b837e2cee1f6c15