Malicious PDF — malware analysis report

Static analysis result for SHA-256 153e1e3d978cee9d…

MALICIOUS

PDF

89.5 KB Created: 2021-09-17 02:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ef3d13fa7ce25d3d6874ba0717e93ec0 SHA-1: 5ec1065803ea4803e55ecd22fc4810a903ec2997 SHA-256: 153e1e3d978cee9d5d8b46754f6ea27c46668000cb39026176bf6b240223340f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=best+apps+for+android+auto+2021 PDF link annotation
    • https://aquarell.ro/userfiles/file/zekipaxupema.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/juwobimelugetijizopekez.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109092200463560.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/95e01981b746ca412cc90ee936f321e5/84419921066.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/rimosuluwopegonelux.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/risalodufalivowapopavi.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/12094269108.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/pobapen.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/34069405621.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/lobiwotezusurewe.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135735df2e1f---miworijafikejugexuba.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/21248221128.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/busoporuf.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/28964698470.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/sikadojovobup.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/92639558645.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/muzojujagudes.pdfIn PDF document text
    • http://bociany.sk/media/file/lufubabunarukakunatoxo.pdfIn PDF document text
    • http://ecole.ru/text/images/file/37572500095.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/zibugibofigemezona.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133db5da065d---dobesunisa.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/betutifijenexe.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/1d4844053edd0641d580c1ec76b6a0c7/rolakutarerixos.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/99913093881.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/93018941914.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_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 10892 bytes
SHA-256: 055f658eb70a8f51b170cbc9a59a96064ebd417fbac2ac04cbd58faff9fe3c8f
font_02_sfnt_off00012a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5E 17664 bytes
SHA-256: c9a87221ef8bd03ea741acccd7c3bec9c94bb213eebfc52d1a6ad0b7dfc3dc6c

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