Malicious PDF — malware analysis report

Static analysis result for SHA-256 4791a9c8a819eb0f…

MALICIOUS

PDF

87.7 KB Created: 2021-09-12 13:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e0a8e307603301905e1b97d4a7975a8 SHA-1: f74d893eeff7b5fa404fca34af75b20d3811fc36 SHA-256: 4791a9c8a819eb0ff085f92ca58bbaa2e9fac14e0c02f7486bfaee25e5c134dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://infrive.ru/uplcv?utm_term=captive+prince+the+summer+palace+pdf PDF link annotation
    • http://naviway.su/upload/files/bejoneregigumofuwitil.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/vonutilixufagununoluxip.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/xegobibig.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090218144066.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/29003486912.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/wudazolodifaxiv.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/gobivosetozubuvizak.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/lagade.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/rasezawiwosid.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/28139049191.pdfIn PDF document text
    • https://music-group-store.com/upload/files/juboxamoxenumogudobowuf.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/zunovosulex.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/kakopasalawonosirunu.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/zoker.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f9622d061---sologesajavitejegasofava.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/mokadujesedazaruk.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109100347398034.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/ludeborezoxerimateruv.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/l42al6gieqp6om25adsd8eclv1/jonigunuzixemepibefiw.pdfIn PDF document text
    • http://charivne.info/images/file/6969111450.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/a07b1ecf7f621df5b31addf49409c809/rosiwufolugazofebobiso.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/92860652198.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/zogumerebe.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_off0000ec32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 10960 bytes
SHA-256: 0b204954eb298451bc6416eed703bda643461107d036c5ed887cca5a9008dd9c
font_02_sfnt_off00011d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D88 19892 bytes
SHA-256: 977cca5371e9520b40da4c544f4cf78ed67edc86540fc4b753cea84d23f912d8

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