Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb685f24f9a24e1d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-10 06:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a6c24582a5383ccd61da37594283af4 SHA-1: 7629f1bd6d222a9b66b861f2cf5f3facaf87391d SHA-256: bb685f24f9a24e1d0da627cd712273266d8b08d004d0274d5f01b6fa6db01fa1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://inhome360.ru/admin/ckfinder/userfiles/files/48593904233.pdf In PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/bodevad.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/9315686899.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/kunobavizedifarovefogu.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/8147440157.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/636c790bd3f73eabe63d44ae925a91b9/podorevudameke.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613abbf5bf729---19694911197.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210909070333.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/fotusinomotaba.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16135808f6eb85---92678063259.pdfIn PDF document text
    • http://saint-party.com/media/file/senonokej.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e378855a---81722448141.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/79720824501.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/44766848122.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/55197650023.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/tegigelofekipuridarenu.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/dabubumij.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/xifujunemowoxenogipimefun.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/peloroxetirowadajesuxobu.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/senasasanobogiged.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/44847649533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=dubbed+movies+apkPDF 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_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 19708 bytes
SHA-256: bb3029c3a2711ae9df8acc77dcb045edf69fb01c340c3bac7bb09c709d0dcdfb
font_01_sfnt_off00011142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11142 10604 bytes
SHA-256: 453a19a663d47ef7c035e318f7a19536ba9fcd79d860f0c5213f27df0a8f96fa
font_02_sfnt_off00012950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1