Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b00212adc2e52fd…

MALICIOUS

PDF

68.8 KB Created: 2021-09-12 22:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 503320a3b3ed4a0ea81c91466eaaf202 SHA-1: 34165084c1e23598829eed8fdb95ac88e5a627f6 SHA-256: 9b00212adc2e52fddc3e522e15ffb0226b1f0083b21315c1ef39dd6edf4c5e5b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gibisch.com/files/files/2005366919.pdf In PDF document text
    • http://mdsalon.ru/img/lib/file/mexewawixapitemepubef.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/zetajuj.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/32131218324.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/43487045816.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/zuloraxexolotuwi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c37e4cd329---24001272199.pdfIn PDF document text
    • http://kleiberit.ru/files/file/76683261120.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9a4fa75fb---jefubaxowalabajurewujised.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/62988914615.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/pazavudowupegi.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/21722820256.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/80551727139.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/20619536095.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/25185294224.pdfIn PDF document text
    • http://compsult.net/userfiles/file/titomurerukebuwizivobadus.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/kunakilovugo.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/bokepizexezazoxus.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/fubupizufogakimawodofiled.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/75162051379.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2e8d5b9abd3429221af66484ef8c0a23/61443906186.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210904111241884323xkk1kj.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/vidadulevakuwijuvol.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/dazukopajituwuduzozawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=worst+skin+fortnitePDF 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_off0000b149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB149 10084 bytes
SHA-256: 450b77fb2a4630900ea3b60c2019a98810d40e739cb52ca73c0776274cbd829b
font_01_sfnt_off0000c7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E9 15144 bytes
SHA-256: 44e565b98321d0975450ffa32a635a551b9a37db613a6652a22366cb37216be0
font_02_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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