Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84b01de4c6df4a4…

MALICIOUS

PDF

120.0 KB Created: 2021-10-05 01:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7c1bbc6421f9595a2aae2aba9179e0f4 SHA-1: 71f70ddecd319dcf050ab1a741d7a7c8b9fb40e9 SHA-256: c84b01de4c6df4a4e6583fcba3d4257220bea1f7f80b622784bed07c2f150b1b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The primary attack pattern involves luring users through deceptive content or SEO tactics to click on these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://drafthe.ru/uplcv?utm_term=evolution+theory+by+charles+darwin+pdf PDF link annotation
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b7594e5bc---femoterorezuvusawubalaw.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/84505783164.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137fab52e950---99372435026.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161539bb01ff41---89637867045.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/84428195806.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/73225784899.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7db137d6edb90e91455e959e8f92a8b3/54259079731.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/89516039972.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109091159583714432aw3kpgpg8ot.pdfIn PDF document text
    • http://xfswchem.com/upload/files/12632033367.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/592117539.pdfIn PDF document text
    • https://pbanerjeeservices.4digitmagic.com/userfiles/file/94301901308.pdfIn PDF document text
    • http://tattooindex.nl/images/uploads/jizijitubogodo.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f6586d2cf---59712576125.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f20ef1fa8---zixini.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/luroxexalebuxibal.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/bokamupuxivebi.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16155b2e5054ca---kamodejotugilavanomom.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/zavewesetusetudujet.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/witovezada.pdfIn PDF document text
    • http://rurisnet.org/images/file/wagadufitarogizebom.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/3a77148c40c6921e67b54367fbfb22d8/feketodubakepabikose.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/87686882648.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/dofap.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/xexeniwomubigutiputin.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_off00016887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16887 11208 bytes
SHA-256: 963b58ad4463b56c53b6966984e5d1b9ef5013b1a56ab210c3142a2ae6394e7c
font_01_sfnt_off0001828d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1828D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A9F 21504 bytes
SHA-256: c1698e5b022d844e0f626b7f6f1e8e387c4e947267799a0cdeab16f2bcd5cc47