Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbdfe47eb4af5dc…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 10:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31365b055ddeaf7969349f72d56a6921 SHA-1: e6041bcfcab74de1aa638de0901882afa8584942 SHA-256: 9bbdfe47eb4af5dc5b59432e7290f071b82bcb59759427c8d353cd44393390b5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms for SEO manipulation, often used to distribute malware. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://allytemp.ru/uplcv?utm_term=environmental+chemical+analysis+pdf PDF link annotation
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a2677c7c---dijolugilejezasusimidev.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/dodakavadifadagabar.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/16935383009.pdfIn PDF document text
    • http://dentherapia.hu/files/file/wopumijuzegogajowe.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e705262ae7---10580996699.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/goguweno.pdfIn PDF document text
    • http://prosquash.by/data/romabutilud.pdfIn PDF document text
    • http://fitviewer.de/files/file/rarazol.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccb1833d77---fabewuzibutuvikosikuzozu.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/64607255079c34332b65cca77e37e1a5/50817141703.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9dfe336a91d33a3b9135635d4222a703/wodufalesupakixovof.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/bimewozo.pdfIn PDF document text
    • http://envigest.cz/upload/file/famatosisujovegoroxurab.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/65537020986.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/buveguroroguguk.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/vigafotonawavomutib.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16134bdf86c82c---kamaropolovuxuj.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9c0de637dbd6a84db2077fe253a8e66b/33161738674.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/devizifukatimarawijaj.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160795645bb33a---xipogawenuwovoreza.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e633e16ea5---75666315694.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/64979611112.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/48fe28055fb9b0cb5d0cb0fa8ea9e97b/23314747625.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/siparadumivatujilumo.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/kikobon.pdfIn PDF document text
    • 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_off0000e2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BF 11048 bytes
SHA-256: 174dd9f27eb270141e0990cdfb5e1803c8aa2716936c80bcb356b590829e381d
font_01_sfnt_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 17364 bytes
SHA-256: 219beb1dab6db88a62492164111d8e1a98baae4931a938c1b60d8feace07d64c
font_02_sfnt_off000128ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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