Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6d708ceae955b0…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 07:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 65783a9b29ab89fb79374e6ec2d59cb8 SHA-1: c724d84ca69ff31d33d91db4da6620659da11e51 SHA-256: 9a6d708ceae955b04131711479c6e9b58f89ea2731107d49c19cbebf56cdc2fa
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting an attempt to deliver a second-stage payload. The ML classifier strongly indicated maliciousness. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the malicious intent of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365413305d3---1957197759.pdf In PDF document text
    • http://yucehukuk.com/resimler/files/90686495612.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/porowur.pdfIn PDF document text
    • http://eventechsite.com/files/files/44531320104.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/vojisilawomoxi.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-18/images/files/36153477858.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/risesa.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148b8eecd631---91409271944.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/ramakuvadodilixejuki.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/tesesikipawotokufasila.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/28485954391.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/be9dfa6d4e1ac7df233334401c1a278d/17405888002.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/rajexineboxij.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/luwenipigup.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/suterimubepezumix.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/sasojegat.pdfIn PDF document text
    • http://byecook.com/ckupload/files/jalivamajobef.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/lijonikekoxetomiv.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/31593484453.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/viwelaj.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109161758259300.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/rufiwivovasonuxilumurido.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f2619d3c1---webudimonalufuful.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/visewotosadiveb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+credit+card+number+generator+with+cvv+and+expiration+datePDF 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_off0000afe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE2 11216 bytes
SHA-256: 06e3f485d2e516ace8be411f7b0c0b6994e29eac6ee2eb78b2791e8d922ba599
font_01_sfnt_off0000c993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC993 15964 bytes
SHA-256: 58730979ddca83eae934a8681b26d605335a001e5b9f66d41d0ca5f332cae68e
font_02_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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