Malicious PDF — malware analysis report

Static analysis result for SHA-256 a623c01a9f4aefb3…

MALICIOUS

PDF

92.5 KB Created: 2021-09-05 08:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7e91ebc6bd2ea0f9cd66b18c68ebb3a2 SHA-1: 6b036bb3d8c2e0bca52a74a3670c86692de82067 SHA-256: a623c01a9f4aefb32854afb02b4b48aa979183a6d8891c91b2279f95bf1c318c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=list+of+engineering+colleges+in+hyderabad+and+rangareddy+pdf PDF link annotation
    • http://eprdel.cz/userfiles/file/gisodumobov.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/26316623541.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/xezore.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161264ad8cf70e---bikirifuk.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/wikavetotixu.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/64609850673.pdfIn PDF document text
    • http://lobi.md/userfiles/file/2766439629.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/66274668167.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/19867153112.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e6237ea760ca45e385a3f24d38305409/86055619098.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/393e25db03998e8c2b361332d103b3b3/95589116755.pdfIn PDF document text
    • http://shesob.com/file/files/nolosagitad.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996c1626810---36739252898.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/wotopokakawokikonuzisu.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/df057d41202ffcb73faf34ddf1812b86/12162215948.pdfIn PDF document text
    • http://fittbikese.hu/files/file/gojobonifum.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/f2a8da201c3545b80c17e0c5da4a6d82/tapixanowumuvozu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf57d38028---magakusigagiketeg.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b6b55b51c25a3da0ecaf1a3b5bc15d87/lijowisuxonototifimigi.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/55462781404.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/48907419502.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/66330535493.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/11934673084.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/tivekabanurek.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_off0001026f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 11112 bytes
SHA-256: 867c5fb0976a6d400f2a8bdd411cc55c30d72175d7d7dc547ca63fb16b289a4f
font_01_sfnt_off00011be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FA 18244 bytes
SHA-256: b6ca57ce509bb0749d4418d804e7e38e6fab8dedb86417e01a9487100ac73cf1

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