Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b87a7724931493…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 14:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 03d9045507386295c9966d7b2544a980 SHA-1: f1780436015b40bb365c67a14ac3fa094a6af029 SHA-256: 10b87a772493149316d9804d18533703a38e25367078fce59e8523d009d5ca12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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=the+married+woman+web+series+download PDF link annotation
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/lofifuzerig.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/57903247546.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8ce38885fc90680fe2fcd4e96064f894/5864175918.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f045fbb872---jimoweripamele.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/bewivenebu.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/a635a356a9514e6f024c627ccb343573/59829973212.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/58776902858.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/sajarugalexosegawesexatu.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/65171585898.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/xuzararusibatuzorimak.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/53284330292.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/96815650039.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/liwan.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26223130262.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6e07bd734---vasuvadutinebini.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/80546593208.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/dupomipexujono.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/64248634131.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/56012544731.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16139d17dc8087---kinekoxo.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/zaxexatepawapokapinus.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/joredorogemititugefo.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/67336126656.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/9977435562.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/41578101729.pdfIn PDF document text
    • http://surestegc.org/documentos/file/xedubimod.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/10471194486.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_off0000b77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77F 16856 bytes
SHA-256: d33ed472d7c974596c605ae99ea0d842b7f952f85f67e553260158576e24392c
font_01_sfnt_off0000e24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA64 10604 bytes
SHA-256: a1c97ea0ad052a23488e481e5b0663af70fd863da951e4af1ff3964884306c65

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