Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1add3eb4ad17ed…

MALICIOUS

PDF

117.0 KB Created: 2021-07-03 18:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 551603dcff30687d1b47c3c67a3d753a SHA-1: dd596d35b838d08c41c35655ecf489c3628043fc SHA-256: bb1add3eb4ad17ed7f0a4f9c6b267a71e5b3b1b9b86478d997429e63d5361275
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://kyanite.tv/userfiles/file/fovegu.pdf In PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ef4b2319b---dovosezomizegamisukajas.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/068ea33c9c457cfb105bcc32f8c731d1/gewotekom.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/77906404138.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098836e97727---poreruje.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/gafirefomupejimixuj.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/cb714f9efa07849dc4be37a573aade8a/54172159597.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712fa0ec448---kozukatofu.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d693b229e48be7da0a3b0e10abf5d8a3/61765286142.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b75c4ae8ac2---55175022052.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/gijoduwel.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/24083d87669c7162b1f6fa0793e23fb5/josorumumopo.pdfIn PDF document text
    • http://altinay-law.com/images/file/2641300219.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/3qn78oup161qn62af2esr5ivs3/dojimikoxo.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/68539529806.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840ec6352e8---xurumokavamub.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b44954cef55---posulatinosolisoxi.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/kusuvaruzug.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/japotefado.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/40c2a9c0dca6b84f8ca66c57d3098590/14809656961.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdfff03c16---15745499208.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af91cca027c---bozezisijokewapufixe.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/16870216518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=wages+and+salary+administration+project+pdfPDF 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_off0001657c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1657C 11200 bytes
SHA-256: ab0b796ff5a5bbe4e07418a342bc439e002fe590e3c4f735feb588b09a21c9e7
font_01_sfnt_off00017f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F7A 17752 bytes
SHA-256: cc52068039d2c27deae6bcfa0a450d5c01c262ad09c8de18b865315a1a52e0c3
font_02_sfnt_off0001ae4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1