Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f6fb28c2b8ca5d…

MALICIOUS

PDF

88.7 KB Created: 2021-09-18 14:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e58760a820cfa6e3d32495a9ad6a95e SHA-1: ff56a9fdeb08afaab089e31586fc43732cb4bfce SHA-256: b6f6fb28c2b8ca5d966d83fd960e5bb25a5124fb486c3543d00fa0d11e94e32b
164 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 websites or disposable hosting, indicative of a link farm. The presence of embedded JavaScript and a high ML classifier score further suggest malicious intent. The primary goal appears to be redirecting users through a series of links, likely to a phishing page or a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=how+to+download+to+sd+card+android PDF link annotation
    • https://myclubowners.com/userfiles/files/fulijolerumafez.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/9304688239.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139175f866ac---lopevoxufetovodotisuzitaw.pdfIn PDF document text
    • https://jjpremiers.com/files/xenolagugegaxibajedezanas.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/tufegeluxiwunemi.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/wuzekexomesaxebawup.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/77478567879.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/89922441333.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/fonunidumuw.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/82937899067.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/widakafatinimunokav.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/genaralozomigufapidap.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161445a940572a---daradezigunewademegu.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/mozutibizuxeko.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/rafifid.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/54775442041.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/58778667336.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/kupuxoxux.pdfIn PDF document text
    • http://snft.ro/media/file/pageledibanin.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/moxiwotukajepibe.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613508dd1f56a---kunuwureje.pdfIn PDF document text
    • http://zaiger.ru/img/file/2956650499.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/gaxiruvojeganetodinup.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/sezutupeboremapojumerogop.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_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 10308 bytes
SHA-256: be27538f776d51994c07b0ffffe4bb5480827547641ed70bc21391603946f448
font_01_sfnt_off00010c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 18836 bytes
SHA-256: 24a69f0d6d75e5f136877fd4b17d35266bb7007a1b816e769f5770e6fa705c20

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