Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68e4ba8d0f0b423…

MALICIOUS

PDF

92.0 KB Created: 2021-07-07 16:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 471bce49d05b3e9034273063dc59ecdf SHA-1: fec2b7c6331c025911f738ab654b3b6167403ca1 SHA-256: c68e4ba8d0f0b42319b16e9073f6d667ed2938d06ddf2ba7f5e9ea8a5bfcfb5b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms points towards a spearphishing attachment delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://baaningdoi.com/file_media/file_image/file/zatane.pdf In PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/eddbf7b63222e4498c9d36d1e350d139/91168120914.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/pulftn26ovqh1vojh2cf0emdn5/giwulowilisuwu.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/3uh9gntqjsfj4pqds72b59fdp6/13526165576.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/41239946838.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ukg2pil317h2jgj6ue05g01d63/nudijofepi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e436af167d---31840271285.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/8cd7d3ae09c00ec33dc2eadb898e8d6a/denuvujurefutiduv.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/2103065805.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/lukuq1lcjomuupesidjmhnufq5/gewimor.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/tewaz.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c8b54f7d3---7740822776.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6f612061e---kixebobogebupoxelir.pdfIn PDF document text
    • https://penal-garazh.ru/files/20044273394.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/wuwoxivukuxi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609696251d406---85269207308.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/zepiw.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16094755243cdd---2676879441.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/b7l8rgh6e2giv7p8qn8f9u1j95/45636917459.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/42eb699e3466123789effe44a5e705e4/44399295655.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/nso8ou5dfrapi4kj6gui9v8604/43796832214.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a91b25f9bc---gigejuzatujifedoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=barbie+and+the+popstar+full+moviePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 21596 bytes
SHA-256: f6f4c61eaef044cbb9a0b3ed717e7845a2685b183cb87bae07d91f9e89a35fc7
font_01_sfnt_off00012554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12554 2700 bytes
SHA-256: 654fc32f42eccfd17e3d34da9107a129bca2bff7f2edac673c4ea3f397261195
font_02_sfnt_off000130c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C8 11124 bytes
SHA-256: 53984ca182739bb92724ff28964b09593e4fd1de549c4a3db015d8e873bf1fa8
font_03_sfnt_off00014a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1