Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac513d1f1fc72797…

MALICIOUS

PDF

85.6 KB Created: 2021-07-01 19:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 706a0c66a77c3c0e85deae487aaa2dcd SHA-1: 4fac2dcb4c317c83b64046d32f2685df7e3b887a SHA-256: ac513d1f1fc727978ea7b554331eb973fc3e40d9afdafaae0c1849cb6265e392
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to external PDFs hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs users to open a password-protected file, a common tactic to bypass gateway security and deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crysiq.ru/uplcv?utm_term=premiere+pro+high+quality+export PDF link annotation
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c30e70b8f5895c0d409c0530b0373ce6/62116014995.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5016bc7455---30231639224.pdfIn PDF document text
    • https://robertbah.si/files/file/ziwewuragodobewupivumami.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/zetudamas.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b0883ed13d8---62021424636.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c8ccc868c1c80add8952a48e2ae89673/79256789936.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/berinokow.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080de3dac934.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609df7032a8e0---35427102399.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f816d52c983bafdf3f33052cb04c47ce/wodisiledigav.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/jofigotixuzawekow.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/lupasifugoj.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/646a1a7c39a0500ea995731187bc3282/12072915692.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160839d76628ec---kijixojozafekaji.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607912de43323---7578491748.pdfIn PDF document text
    • http://www.toptehnik.si/images/gevigusij.pdfIn PDF document text
    • http://tafoto.de/img/upload/files/14137572599.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/q3bap0frpt7oaqqu00ga53fet2/xazoxuvesado.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/92432700655.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/a5c51bf2fa05eb9e255694213d44820b/7444361415.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e97e5ddfa6---lagof.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac0da5eedb---12431923526.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/t8mtcv1sn8sj37mcqbbplitnk7/73886393141.pdfIn PDF document text
    • https://vestol.bg/files/file/60536113269.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_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10403 10892 bytes
SHA-256: 34a8cffa4739127803466477168acf6b7be4cb3bfc7b39619739b279786c2a3b
font_02_sfnt_off00011ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 16992 bytes
SHA-256: 4680f733a348ce05ea87c7a365325be18834b79e36c4000267da5f00f121cacf

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