Malicious PDF — malware analysis report

Static analysis result for SHA-256 6594c9ea367d6386…

MALICIOUS

PDF

88.5 KB Created: 2021-08-07 05:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70567ba06e6d695c5efddff65b9ce7db SHA-1: 1d46136f5c470f518d177fb82a1b34827bb539a7 SHA-256: 6594c9ea367d6386693c67f13584615e23b3e60f4667e1e35597c300b9c027fe
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple PDF link farm heuristics suggests a deliberate attempt to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://toastwarenhuis.nl/app/webroot/files/userfiles/files/jupemoninat.pdf In PDF document text
    • http://akinmedikal.com/uploads/file/86388671461.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/kudubarunorolav.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/83397228060.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160907697644fd---morawedexubuj.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5b0c67129---rixeba.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/zufejezeruxi.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/05f852953f7dc8a75d19c0a5d52c6864/juvum.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/50892398420.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757774181d2---dirilewokodevuvenaragetaw.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa88489f08e---wabinerowabufugegan.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d784ba050a3---rolotinenuxesika.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/20700045130.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/mejujekix.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202107031851325546.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a80094a7fd2---47768203882.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb4bf093d---48787946516.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/uma1c5bl2bucuc3vsq7l5hu4a1/82162947483.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/75501f0d1c73bab338dc600af07781b7/38143061555.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/44873117360.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/rasen.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/tumjcku8cqc7pk95t7skotprgl/jasimusopata.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/timije.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/77128652453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=vocal+remover+online+free+converter+and+downloadPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/02e72b55f82190f51c3dd71527e6228a/jutagilaf.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_off0000f734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 10588 bytes
SHA-256: f6df7044b559826123866e7be4134db690f1b33206cad01dbef1762e0ec19b4d
font_02_sfnt_off0001277e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277E 17176 bytes
SHA-256: 96246d69840e745425f0db1f4a5d1a266ca34087ccf0f485cb9b91358047a201