Malicious PDF — malware analysis report

Static analysis result for SHA-256 82dcaee5e35d1f4b…

MALICIOUS

PDF

85.1 KB Created: 2021-06-30 04:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a079c8ba0e5a759d207e5e9bf24f73e SHA-1: 2e697b3706b924a2b7e386d859b9eedf89044b44 SHA-256: 82dcaee5e35d1f4bb11409bc7e6a139a43d712f29f35b55477c87898ea52f44d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=lewis+structure+carbonate+ion PDF link annotation
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a290f1adc2---64016787725.pdfIn PDF document text
    • https://soechi.id/userfiles/file/jusuroziverudi.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/rufofawokowarelavajujim.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/64294114228.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/51998483418.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080492ff21e2---36709449930.pdfIn PDF document text
    • http://ihdbd.org/upload/files/37138106336.pdfIn PDF document text
    • https://advik.net/userfiles/file/52862745618.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/1877ff1d58bb32df0249fa4eb68d2c2b/religawop.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc91a029c1---fugazojesifukojup.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8643aa61ec---74449044777.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/sarukexomikuseg.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082a310d708b---kisagoke.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/61514130726.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/umeo8la5fotdlkjdmvgn4eomn7/21023773112.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/lopelixikimosotadixef.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e583977fdb9b6191a325a24fa35cbdea/felupuwidavakexuna.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/nipumumelenijiwule.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/66974951005.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8e161acd8f7b67b417bc66114111068c/85845704360.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/96552467787.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c49049fd---64772461758.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a6cd76d8---8133063211.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/34955844445.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3215465ca7---pesupulixorijeluzapiwi.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/vqlbu78kdfkp8okndptgjsro15/fagefuvovilijob.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_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 10460 bytes
SHA-256: c6670a1f180fc303c624de101d88c0b8aaa4fd95930a8eff2f975cddb8523ce9
font_01_sfnt_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11806 17876 bytes
SHA-256: 2e63699d3a43f690eb42832daf228a11094783c85389edef936e6213d5234790

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