Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e2097ff2474db6…

MALICIOUS

PDF

77.7 KB Created: 2021-09-06 05:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aa58c19041478729c7c65898d90061e2 SHA-1: e30066808a8530d04eb8ee80de8887d7b8b0e3dc SHA-256: 85e2097ff2474db6226b47b278a241d3ed5eaa923f9ada9d514ab3fdc18f98ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although 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 0.9973

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=upright+freezer-manual+vs+self+defrost PDF link annotation
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078e4851cef6---8591574906.pdfIn PDF document text
    • http://anm-av.de/uploads/files/87384335035.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/zenojuvizim.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4dd64f3b37f3ac1c9ad30e1023a42b64/jugesoko.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/lazukememasobumideposil.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/58035174949.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ecedd33ee---67461123457.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/004fb3b1731050dfbe8e74833df2795b/47907045409.pdfIn PDF document text
    • http://teplospectr.ru/images/files/27749506351.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/romazefaxuwelak.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/xerodobon.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/65590446758.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/cbe9e6aba2c12eb50135550033e27321/ruzanonu.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba82530db3---75756128519.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9858d866f---foxufikatogulabupusugurak.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/5272680545.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/meridolinokikazulasobajig.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb2e792a0a---83879316367.pdfIn PDF document text
    • https://yasacompany.com/upload/files/14967873686.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714311ea8a2---memiminuf.pdfIn PDF document text
    • https://ckmandarin.com/uploads/73764836403.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/38039549133.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/7d7b1cba001f5e61be8dd1a76e98c56f/21494951932.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/xawojesagixogerexivobe.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_off0000c95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95B 17544 bytes
SHA-256: de89ef74fb2ee42b6319e43426a0c549eb05a33bbdf6d329ae39c349ec955398
font_01_sfnt_off0000f6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 11212 bytes
SHA-256: cc2f1de4a6d03041c3fca601b09cee40f73f74955c28a7de3e50af85680ea338
font_02_sfnt_off000110a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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