Malicious PDF — malware analysis report

Static analysis result for SHA-256 730a6b079e6a16e8…

MALICIOUS

PDF

91.3 KB Created: 2021-07-05 12:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: acdd5dd701f9fbada72618762d90f7a2 SHA-1: a5b0acef6a78ea219d78c10d61cab4d039fde1c3 SHA-256: 730a6b079e6a16e88e67357b61b1df7b458858311917df0593aae601d80c5ae6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to potentially malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c4eb3e47---99944788141.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607871a339ab5---zagafinefadu.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/8ab9c40b2fea9eb29c23dfb34697e1d8/77498531114.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/sudupisuwudimuv.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a23c2167---rafomadifapufodedukowufo.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/19586416628.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/kiminonuf.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/f3hg6ovqe0edlrn3dkkdejspev/vepubonixapef.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/a5mlos7h0ilesk87p4t5vri5e0/jolurezezifodeloxewegis.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/837a4da3f1dfeeac469f9d7178488d01/52469463398.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/1u1rtkuq20m4f0dd60uf52vv9p/fotimawejulujukosidagam.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/30125875330.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/vqu7th1ha1er9ehss1phjc7149/sapekivubonifik.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/02c6a1ef5c0cba3f68f20f25654f018e/bekewufudev.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b74af3393---38676817069.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/velanadunap.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/barobalunurobuwigunes.pdfIn PDF document text
    • http://redactron.com/userfiles/file/34484230841.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607829a2ead12---gowamenabojopesel.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097e4078713d---lidukavogegududiruxexepo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad7c1755e---92115785063.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9afb26d6c---wilupotijelegi.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/zojufokirifafolujutokil.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/88bfmo5dsahg9s3rscpq7k004g/86434656749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=accounting+database+design+and+sql+implementationPDF 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_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 11124 bytes
SHA-256: 770049e3638eaa96dc58720cf3194c4eca6cdbae85101c97f90f31de41c8008d
font_01_sfnt_off000118d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EA 17812 bytes
SHA-256: df7344266761531ce778089302b0191bfdc4c3ff97736d2a59efcc17de788b75

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