Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb62e183b6f1b0c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 13:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: adc034628b57593f7c27c869cdf8f0af SHA-1: 82b03d86414cdcd10cefb46eb055bde9c75591d7 SHA-256: 2bb62e183b6f1b0ccb8ae36cb3821604603cc63df73b42c541a2a7d6b87100c4
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, many of which host other PDF files. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially malicious content suggests an attempt to distribute further malware or phishing lures. No scripts were extracted, but the structure and URL patterns are indicative of a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/edscumer0n0djls8obnj8g5o44/kedipozujawelonitixukibot.pdf In PDF document text
    • https://istanajp2.com/contents//files/41874917036.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/pozogamusokabafeve.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/megazelugurodokifeturunaj.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/senokorejuxo.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/p5f547lh4jenvoau1s12ot0ks5/namulodogedazosadubowezi.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/264612d2f7b0f58ee7fadbd439038b84/24973605691.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e534ce492a---90104615095.pdfIn PDF document text
    • http://builderall.info/userfiles/file/42993697999.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/19864229850.pdfIn PDF document text
    • http://novichiha.ru/pic/file/gupixavasofufikamabavuvek.pdfIn PDF document text
    • http://lelit.nl/app/webroot/files/userfiles/files/redenuv.pdfIn PDF document text
    • https://tl-systems.hu/files/files/jogimelimedejiterekitekem.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b981cc97d---39745285231.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/7b069089cf474e33455f6ca4072a1e3b/9750192955.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1f2e98da---88310415752.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/larutefuginolixu.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/80917102610.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/74785030182.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0b343f886fc8353f1b8070ca9e5e80f/86412009916.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16101097ba649a---83652665267.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075d47b13285---rurefinanudedit.pdfIn PDF document text
    • http://vodnik48.ru/content/file/15232487896.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/89226829572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=1st+grade+math+games+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_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 17056 bytes
SHA-256: a9a217498c42481847f12fe7151a8bf99bfa9fd87b924af4486be0ef3b10e23b
font_01_sfnt_off0001094e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12165 10540 bytes
SHA-256: 484993d922959819ea83e2d7fb6474af1b228450e3333ccc3783900e73b959d0

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