Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1febe400ae015d0…

MALICIOUS

PDF

68.3 KB Created: 2021-09-21 19:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48986b2e1cfbd650d172e7215d929772 SHA-1: 62a56401d00cb0dc4dc106b7db5e3bc54c1c657f SHA-256: c1febe400ae015d0fd0e1d752259ef6c9e83ebf0458dd67884d7fdb2a3aa2185
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://allytemp.ru/uplcv?utm_term=gta+v+online+game+download+for+android PDF link annotation
    • https://am-system.eu/ckfinder/userfiles/files/nawekibutedemufikosike.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/33808848318.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/vazajozoxexiwetazafi.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/55709444619.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/gezotibagolibup.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4b70bc7bd---21670268641.pdfIn PDF document text
    • http://strap.sk/uploads/file/leviwudopalufalag.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/475935557.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/39319391067.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/5473907954.pdfIn PDF document text
    • http://e-sportis.com/images/upload/mureke.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/35836266521.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/mejusumarofe.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/80870201878.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134c081df10a---51225602518.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132f5aac398b---56204705273.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/45220428938.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/78e0f9cd3ac9acb99a4b8064ce2c0021/75847942254.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133539944f17---91532017372.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/datureviganisuzazigunutux.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/21046122145.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/runojojumunisiwitizukuv.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_off0000afa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA7 14368 bytes
SHA-256: b94ae58c66b3d222b125796689ead811613a3415a8f5ddd205278df62fe3c18b
font_01_sfnt_off0000d376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 10720 bytes
SHA-256: 5808fe83b22ef7da6e86184989badba6ff2f5ee48fa4d30524b63491c26b5c75