Malicious PDF — malware analysis report

Static analysis result for SHA-256 6724e9b2fb3ea76d…

MALICIOUS

PDF

95.7 KB Created: 2021-06-29 11:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f985dff2405e0d76c2ccc1527978f945 SHA-1: d484dd34d8b2da2801c2f5b9e2761937864e84f3 SHA-256: 6724e9b2fb3ea76d0d5b5502b7765ae388f80f918302025109f578f2f8ce681d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is unreadable, but the presence of numerous external links indicates a likely phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/6f3ee47bd85554ee84056419023ece98/4096762900.pdf In PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/56d1b90ac24e13bd5cc49c0a2ef396f8/reteperuvenexa.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/vitigerukepime.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdfb2170a0---39082750612.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/h3d0bkaurrv0l1bgeleibp0qnm/piselep.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a00a26dba9d---kuvirano.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/46931456209.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/rodipeso.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/69926309883.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608656edeff48---92243198136.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4dd791bbe25b05b23ca50f15c550e2ff/98808500949.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b69d308c54---33192413369.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076788184b90---xefokulagom.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/gijoxiwizamiwebosulal.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/fm5ce7tropku47a3tlmgckg32f/ralovuzawebapo.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/kiseranokaz.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/vgdhjth71j075dc2gn95ot69k5/92719720965.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/tokamudepisa.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a058e75b2---sopulofukanozekeb.pdfIn PDF document text
    • http://artside.org/data/temp/file/82405477611.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/favuvinaziluvurokisi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099d07e14b88---bifepatalobur.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608356c80e582---dekek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dna+and+rna+genetic+codePDF link annotation
    • 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_off0001149d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAF 17792 bytes
SHA-256: d9b4ea5643ec81655772a7bd1b9cf2e33dae390922d64cb355eb4f375d92222d
font_02_sfnt_off00015aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AAF 10332 bytes
SHA-256: ad34286e4197e751545bc63dc79953698eb34f77cbfbea1581c457d41db9dce6

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