Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d37b5fbc6564e2d…

MALICIOUS

PDF

76.5 KB Created: 2021-09-22 09:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b52b159bdf61d32429d7a736c6142c78 SHA-1: 27afb89336bf6621c4b4d5606a1bc1314bcf65de SHA-256: 9d37b5fbc6564e2d563221f025364ccee411cf71819a8554d7105e0f826ff77a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination through multiple redirects and compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=clash+of+clans+sneak+peek+2021 PDF link annotation
    • http://ototavandosemesi.com/resimler/file/95368170892.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff10b46da7---84736593994.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/bunelazafejafomuvu.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/38933890036.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/7653378338.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/suxasixosenapeliwanirop.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/a6a2f632265c256ec00061bb0afa9907/vujakorajewopuzivijeb.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/ninonamamedarutejufer.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/pesakakonamekepuxufixibez.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/63808911815.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614112334af52---kotatufusegiponurem.pdfIn PDF document text
    • http://atrsara.ir/resource/files/82313270023.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/93096566018.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/relavibanovesazabol.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630837403.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/99769985536.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/57810763783.pdfIn PDF document text
    • http://crm333.com/documentos/file/tapopag.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/krtohedknusk6ph0ju67fvcjbt/21455142901.pdfIn PDF document text
    • https://bliznacite.com/files/22682777714.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/bamizokut.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/lefodisexepulojepi.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_off0000c94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94D 16340 bytes
SHA-256: b927ae130209961388427fbd4cbb8a4862c47aefbcbe791705f96092fc139000
font_01_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B48 10704 bytes
SHA-256: efc39a6acb9c43dfa0720a4e9c9e08286b924f06535f4b79d595111c097abae7

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