Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de57cd7e4070b87…

MALICIOUS

PDF

91.4 KB Created: 2021-06-27 08:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: aa26bbb7bcc293f23f7e5ac2d98207ae SHA-1: 79742464d2d7000b4468fe76f81b96acbbda0393 SHA-256: 4de57cd7e4070b8757bb23e9aaa27c452ee7ea316daff0ce8333ac3d7e8d88c9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may exploit vulnerabilities or employ JavaScript to facilitate the redirection, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/dinusos.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f49fe30c77---78334051487.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/c98c3141bdf3579a03a54826dbaa312b/53330228654.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/lijokorenepixifeta.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/63547167083.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a089c4a7db2---tegog.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/98513775629.pdfIn PDF document text
    • http://usa-ex.com/fofekomaxivemidevuvu.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/vusojapawerogofaxadukube.pdfIn PDF document text
    • http://ubest.ru/images/file/12334862476.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b50a26cd0a4---79977413745.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/eeb432e22d9f3077d483b9dc9df3bc61/lexutaxajeji.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160818506c4e45---tokox.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/tagoriwigetos.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/uk7rsktsqub5pue7pec7lnkrbo/duluxukoxufuguzes.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d96ba575e2---10042475591.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/vai8cah7ojnb20sc2qhd16ntl6/21642059741.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/4qicqq34emhabc2ck5h4ium0rn/dijun.pdfIn PDF document text
    • https://digireg.cz/upload/gulisumixinijuvunedaf.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/janunolerudewesegixanu.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5552cfad15356939d610aadd0f1e7c99/viroxitimeniges.pdfIn PDF document text
    • http://limoride.net/gallery/file/8325636587.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/josesexewem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=difference+between+facilitated+diffusion+and+osmosisPDF 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_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 16688 bytes
SHA-256: 997b96d23426053be8cd17fb2631efdd42db0fdb698e93ddd790249bb2d8f06f
font_02_sfnt_off00014463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14463 10964 bytes
SHA-256: aa2636b81a1db3c786f9555062274e2dc5d7f546ac228f915bf8f170a7ee4c08

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