Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bfef7f672e7653…

MALICIOUS

PDF

94.8 KB Created: 2021-09-03 00:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fd110f5b43c7827e5c31bf6365f32c4 SHA-1: 3ff2e5de8a771dcb52f6b5e377599ce0641dc3b7 SHA-256: b7bfef7f672e7653bc7a2a857df59dfae76df9618260e413d31bbd70d0a0b4ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or phishing pages. The presence of numerous unknown URLs and the use of compromised CMS uploads indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f387c27335c618660aca4bb3702fae73/mozuxewaxumuse.pdf
    • https://banghenails.com/upload/file/65126929795.pdf
    • https://negaratoto.com/contents/files/xigoxofunurulefevigi.pdf
    • http://podiummoda.ru/userfiles/file/nazerupigibegefiluguki.pdf
    • http://chaodontuonglai.vn/uploads/ck_upload/files/55208463776.pdf
    • https://liftsystems.ro/LiftFiles/file/12941085078.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/89d9023dfb95c4242b8e1cd3940a3ab8/zumozutakolozag.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/82029967463.pdf
    • http://brilsports.ro/userfiles/file///62851994225.pdf
    • http://tamlaproject.com/userData/board/file/gefik.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160983f375aa4c---1965116921.pdf
    • http://www.tecnobor.com/ckfinder/userfiles/files/tixikono.pdf
    • http://stolocatering.ca/clients/874514/File/96492539760.pdf
    • http://chickendaylacrescenta.com/uploads/files/suduno.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730e8be5220---letoxerudadado.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/9evfqrtu0jhj2s4n4m90rspvqn/19885310663.pdf
    • http://fertilityupdates.com/userfiles/files/82476042202.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/bimivuvateromo.pdf
    • https://tiemhoamo.com/data/dulieu/files/vozivawiduxinutedawevefu.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/puxesomezo.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8eaa34ff7463a9c379113a60a1cf87fb/legarelanuzo.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb0c9a5f0c---85591759435.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/11235095665.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fbcadcabafe1452f953e11c2d81e305e/genudojovupabipemaw.pdf
    • http://loaamtran.vn/files/usersfiles/files/77044663581.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=estimation+of+school+building+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f83.bin
2fb02c8e229cdf4a3d449acf72a59886e8fd598813d241d2ece07eaa1c2ca76e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F83 11056 bytes
font_01_sfnt_off00012899.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12899 16792 bytes
font_02_sfnt_off000140ab.bin
8e6ffa33caa109340c9a072bd3234f11a5873551728ce2cd1765677786db5582
pdf-font-stream PDF embedded font (sfnt) at offset 0x140AB 17216 bytes