Malicious PDF — malware analysis report

Static analysis result for SHA-256 9709431d0d826089…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 14:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5df36c7ddcd2acf7e3f9b8918996e3be SHA-1: 4cd0ae20a8d81b3d9fa4fa82c02275f738431e7f SHA-256: 9709431d0d8260894308a230be3a9aa3cbbdcee9b2b6c093f855185b628f459e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's content is designed to trick users into believing there are new or changed banking instructions, a common tactic in Business Email Compromise (BEC) attacks. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://crysiq.ru/uplcv?utm_term=remote+erase+android PDF link annotation
    • http://metrocars.london/survey/userfiles/files/basasakonogirazagomab.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4antr43rfe3727fnig181lgpjc/bulakobavume.pdfIn PDF document text
    • http://a-pluset.com/userfiles/vojilidobujekutenimulu.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/rofawumusitadip.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/biwivisifoniputedam.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/jodojagovobogurosidavuxap.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/28296781553.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/xigiji.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/60945850401.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/zakesonoxitogapopugisipux.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/rezufevimi.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/xumod.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/84162546142.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/82297099428.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/55994545093.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/79727582680.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/vk0rmjpmh1lmppuudsjgvmp6ff/39521021195.pdfIn PDF document text
    • http://newworldss.com/uploads/file/babirinivinuxunez.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/90434592470.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/bisukaxudorawepenuwedulu.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/75576392788.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/91386473815.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613340f9463cf---bavawawula.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_off0000db45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 17080 bytes
SHA-256: d6b21ab06cec943bb9526b47a6227e86314dc960052e984b8cb53baa9cfac256
font_01_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3C 10408 bytes
SHA-256: 7c031c59661a47404537b6893858faa3a5f0ed1035b7b18814a7c21bd4214b1a

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