Malicious PDF — malware analysis report

Static analysis result for SHA-256 61adca1e667fc075…

MALICIOUS

PDF

87.3 KB Created: 2021-08-09 18:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 97d63e565c843b294818fe9b47c4812e SHA-1: 4578025e538f4d80db786a6ee26a4be4aff3b551 SHA-256: 61adca1e667fc0758e488e82f1b5a120779697deb406fbf28ddb99fcd7e5746a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://wastran.ru/uplcv?utm_term=how+can+i+connect+my+roku+tv+to+wifi+without+remote PDF link annotation
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/bni1vd9njobhsp4ighi4fb49h0/33414755646.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0347648001620028992.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160948ec35177a---27200637218.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/xofununofeguzutononogiv.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/jiwakepududuwobenutuzap.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/nasogofasug.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/98065930082.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608655f31077e---xalisubukemin.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210802124141_419553877.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/boxowalozupu.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/89440276718.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607050e5afa45---minabifojen.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/bomubofavididirifali.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/36629978924.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/982648242.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48424696c---varudolenibivetatam.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/naxanesumawasatomuxab.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/94771272363.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/df0a773ae197a5d522315e42974150b2/69018975930.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610f8cf1ecee0---46516155913.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/tenubezixagepu.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/1dacefad6ff53d15e7be5718427df3c9.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/novimuvef.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_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 10836 bytes
SHA-256: 2e1fab8ebdcb161abc371d8ff59ae616d74f8061281c9ec620b52f0403afaa6f
font_01_sfnt_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 17412 bytes
SHA-256: cd403690fa2835d30879c3142e28843a5bf0ba3a4a7c35a2e6fbb142e55082c5

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