Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1dafbab1e310fb…

MALICIOUS

PDF

73.1 KB Created: 2021-06-15 17:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a1a99f8c9be153b2cb9b58ea0baf91d3 SHA-1: d03ad3b2d8789bc89d70e452d73813c92088560c SHA-256: ac1dafbab1e310fbeeb486d9cd3751fd42b8d12203f0abb1e519d151852f4b25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites. The embedded text 'View docx in android' suggests a lure to trick users into clicking these links, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://wastran.ru/uplcv?utm_term=view+docx+in+android PDF link annotation
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d86851b39---35072464715.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/kulajovobera.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c47bd391b3f---11483271525.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e158c62e591325cfadcbf9fd90564a97/zokejabos.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d5a612b4a648d73cd590377bd94207c/1438540206.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39ff365cbc---kekotuguluwirin.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4f5ed8140---nogarujadadajexevovosir.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/63240311792.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/6a7e3c86b6f5ad4510d8e87a8502e184/wolopalesatexef.pdfIn PDF document text
    • http://gabortech.com/admin/file/wezowofinamajuwulumex.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/3bf33c52cebbd319f071ffb4b93ce513/89733537009.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/h6s65svo8q7ahoo7ipsn2mkjfv/xaximug.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/urcue6sdqg1igf7no9haqvt809/supisim.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/17574064086.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/2s914ebrdjvfnqsp3pnvvauv25/13828833195.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/onh48m611v0ksasbdltjq7ut26/87554497441.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e2e74fb3919c4373adc89eacc5b9c634/lejimidokanepiveb.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832e5ebf8dc---17232613922.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1492510f4444bc153cb67dafad2b189a/dizikowej.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6342d0ee80---pasabab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26A 4848 bytes
SHA-256: f3a036b094aeaf2a4de979bba5af69fecdfebea35e60e5e750d7f52f587fe6dc
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 10732 bytes
SHA-256: 69a40c793f18f92f3a3f64618b1f1803fbb264a07c54899c1389b5521475e0d4

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