Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d212fd6dfc30719…

MALICIOUS

PDF

76.1 KB Created: 2021-09-12 14:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb179849a1991153d13b72540424750e SHA-1: 5dd5f4f65b7b4b950203722129a6caa477bc5492 SHA-256: 7d212fd6dfc307194465f93097f55b2ad075f21b3397723ee461d3f7cc93f936
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://gok-maciejowice.pl/js/ckfinder/userfiles/files/33105689180.pdf In PDF document text
    • https://kanat.com/upload/ckfinder/files/xodimug.pdfIn PDF document text
    • https://proxus.nl/file/42636944962.pdfIn PDF document text
    • http://kelvista.lt/images/files/xuruvuxalav.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/12309649453.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/sokovaxisenixaxiruxu.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613a937387006---rigowizotosokonuna.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/29808739842.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/radilejegiforudalur.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/96480043339.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/82899690f6815b36678ef4e8eeef137e/kitenuvuzawozatuxudiku.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/16302903135.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/3741851828.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/e4af4025a25873a9fad5de5a93c6f45c/tonogevudupepenije.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210902121758635.pdfIn PDF document text
    • https://aokman-drive.com/d/files/16215646145.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/83096547323.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/kumupimasojomelugupabe.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/mesaxiku.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109041557234252.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6ae2918bf---vubezefidugasasilizoledo.pdfIn PDF document text
    • https://patc.fr/imagesfile/41410238910.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/jotoraxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=miui+12+navigation+gesturesPDF 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_off0000c6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BC 16968 bytes
SHA-256: 6f93ac1f5f09f8c668274baee487e6d0fc942406d74a708e7e66000d5d9a48b5
font_01_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 10568 bytes
SHA-256: 184f4dcf66ef316495c2ff796c0cae70645ca46d9ec1dd9936e4a46c5e7b9df7

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