Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7825cb0e441e21…

MALICIOUS

PDF

71.6 KB Created: 2021-09-09 04:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 712b57bd1a332f86c5920aae688b8299 SHA-1: 1f08686751e0bc8886717438dc465e3670a0b1cd SHA-256: 9c7825cb0e441e217ae8b8c4006288011ffb4de19b7a4d78a30fd7ab44edb4ec
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on potentially compromised WordPress sites. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection or further payload delivery, while the link farm serves to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://pataibicaj.hu/userfiles/file/43416237011.pdf In PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613058bb16ff7---35344105020.pdfIn PDF document text
    • http://schokobrunnen.com/idata/44983813520.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/jarokejiveredunikir.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/nonikiwepaladitinilixam.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/zobasidevigegaxite.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/sukoravesuremewep.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/latelidulovugatikam.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/wipodimesapewetula.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab7e461c8---36258184490.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/56926294040.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161395adeeba49---nasojuwifiki.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/73065613051.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/zipugemebepavox.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba731ac1d---50618617092.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lld2ev77ap09ohofoblq1fdrb4/21382376316.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/tirifuga.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/kusokoguwexebixej.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/foketojirewozeb.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/zameravar.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/85123827334.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/55220089411.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/vesegoz.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/wuzaba.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ab95be3b677ca86ec76fa893d64024ed/dijifo.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/45405939345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=clear+defaults+androidPDF 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_off0000b7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC2 16108 bytes
SHA-256: ca02c70f945002d2e5b7c7c9952ed837c6c6d6c10946e3ac016ce3ee4d6b8b9f
font_02_sfnt_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 10476 bytes
SHA-256: 75138b893dad37a778e6d30207573359328a7cb10db3fc59d3c8682e6d36c56b

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