Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b3e2a7d1b8d3bf…

MALICIOUS

PDF

74.0 KB Created: 2021-09-02 07:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d29582747dc849127725ac6dd5dc88b SHA-1: 0b0e1f9895514401008c52d8f54797842e74697e SHA-256: e8b3e2a7d1b8d3bf994f5af2bcdd70e8e9d56d3c730eff3e0b4a597ffe9109c5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple external domains, some of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://quincy.pl/ckfinder/userfiles/files/20491003334.pdf In PDF document text
    • http://studiomalpocher.it/userfiles/files/9221596615.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/davuxidilajorujepimerupa.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/71047523489.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/weborakanazimipadawukav.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/fuginekurozowiditolug.pdfIn PDF document text
    • http://orthopediedelft.eu/files/gurasabapelimi.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/3630501397.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/91984424206.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d4c8cd48f4872f0c911f405f5d658a02/18476490048.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160968967d49a7---penakivurenefotoz.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/jekoket.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/fidemaledavajogup.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/t4130f2uenrvoufmcbq3o2q773/66966555428.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/91774635845.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/f8a0f2080d1f1a81bff2ce914a39d4e3/wazonimos.pdfIn PDF document text
    • http://yaan121.com/uploads//files/202108010600598254.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/jomobuxe.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/941da126273c3f8818ab03eec3e915a8/mumofefigowunilegije.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/89671736177.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/28081538815.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210714031155.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb74e5875b---vutawalolanomovakal.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210610_E0D8C0151342E99D.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210729201401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=code+14+drivers+licence+test+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_off0000bcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFE 10680 bytes
SHA-256: 3deaf1f244b2f3c3595789784aaebb1149072f02ab2f46d1ff7409d27d4d6a61
font_01_sfnt_off0000d5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 16356 bytes
SHA-256: 9a73e1e9c342aa3cfcccce4f70bc826aa6eb4ef7741b132cde9876646c2fc98e

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