Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ba479a5d9cd5d5…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 18:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 45d331a4585dbe5f59cb8d4a653c4483 SHA-1: b4221d2683331c1ee7f3298978838d02e1d455aa SHA-256: 57ba479a5d9cd5d5f0c57710f6d00b1de4865a74c912f0f9cdaae0106fd93b4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to phishing pages or download further malware. The presence of external URIs and link farm characteristics strongly suggests a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chcial.ru/uplcv?utm_term=examples+of+upward+communication+pdf PDF link annotation
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e46b1cfedc---26546421602.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/dazegogubudopelorurip.pdfIn PDF document text
    • https://schmitz.cz/res/file/manivozakogugugufeliguru.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/tolodidagoja.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/71924900280.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610927fff1461---75816042611.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6e99217d4---kanugamin.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/74000364608.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e2366b01450ae82f7e433ae5a74c1160/13658366618.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/rulozobifuj.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/96778255509.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/laxefegogivatu.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/33141498895.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/wozogu.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/73646080321.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d48600ee9483f1f35e288e0cc5681067/34277812779.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/81945281026.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607611f4676c9---dilexebetomufo.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/remilotuvijemofosemofero.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/10930569490.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/91011708328.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/30406357118.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_off0000d1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D9 11052 bytes
SHA-256: f335c8cca310240e3c4f3b9f03d592f12105586bcdee45222ba942582934e2e6
font_01_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 17172 bytes
SHA-256: c4889c4a0e5ab2c8a29cd3d942bcc540d61a8d96c625c0a937ac7a8a6d40e9db
font_02_sfnt_off000117f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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