Malicious PDF — malware analysis report

Static analysis result for SHA-256 e971a4af6f10554e…

MALICIOUS

PDF

85.6 KB Created: 2021-09-15 10:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8dbd2d49e7d4889a1a463c364bbc4189 SHA-1: 7f79efe1bf214e1550a2ead97b76835a8f391da0 SHA-256: e971a4af6f10554ec68e9a0a8b05b1226ceec5a0459ead0dec0e881670472815
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites or disposable domains, indicating a likely phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the extensive use of external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://archism.ru/uplcv?utm_term=storyluxe+app+for+android PDF link annotation
    • http://bangdientunhk.com/upload/files/48685263826.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b8cd9c67---87947093388.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/64587500627.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03834cf31---ferav.pdfPDF link annotation
    • https://tonerihned.cz/userfiles/file/suzelojadakiravenarase.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/wakeloz.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/fisatagopuzipuropapela.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea2e1a45de---felomigulavajuv.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/xuroviso.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/dolojesof.pdfIn PDF document text
    • https://stvorki.ru/files/file/kojovadutasilulixebiduxow.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/30927600728.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/c037dceba1cb71a65a8572ec938086b0/rakudegisodovovawefej.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1733f1884---1435007375.pdfIn PDF document text
    • http://klhl.com/userfiles/file/xopep.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1eb819544---daxagin.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613497de1dbf1---taruj.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/ziparorenitideweverob.pdfIn PDF document text
    • http://alltechsro.cz/files/63072340080.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/52816604593.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141193a14972---33899280047.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_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 17216 bytes
SHA-256: 2e40c132ca6813aad566a22173fa5a09f7c163631e79ae7b91974b3920d648b4
font_01_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 10712 bytes
SHA-256: f9152f23e9f9e0d845a5a26b44a5ba80143464532d4bc1e66752ceda4bbc31a9
font_02_sfnt_off000130db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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