Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6a538deb08be4c…

MALICIOUS

PDF

128.1 KB Created: 2021-07-28 10:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 411f9a6a1ecabe435a1b9cf4a1ca1e8a SHA-1: 90b43961e1ff8f87f31b3c36312559d87ffdc1fd SHA-256: ec6a538deb08be4c41be5d7d6fddfa9b67513ea997234398eb6f32803c097804
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm likely used for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically classified as a phishing trojan. Although no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF designed to lure users to compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c49a84ac696---5246543342.pdf In PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/d196c2183f9de5d0abea69bb76506f4d/59369165144.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/533b7d17b36a3faa3474d2c72411b822/46793691120.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087988612df4---resawira.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085db84be0cd---77722373348.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5c6e259e8d03f7a7fccd61b201948b17/zadime.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/linamojitusirimup.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/0de126476051c8db356bc635a54c14ed/sanizagatinonibuvidasokis.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/38835574632.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfc94bd8d3---92406862561.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d87a7b9595---tazukosinizodesoxigimuj.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ed734d758---xurogemanodefarezuv.pdfIn PDF document text
    • https://belloverde.net/emailer/file/pavotoxufebuxunazodixu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c6ed919c869---45559338381.pdfIn PDF document text
    • http://wawa757.com/uploads/files/mesasupejibigoguwakaba.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab68b87705---45018246335.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb52aed3a0c---93138398007.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/5739305601.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e68d9b14d0384fe8a53960b724450ca6/60575319997.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/desegibugunijigenovasa.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/zetimusomere.pdfIn PDF document text
    • http://debden.org/userfiles/file/43565889597.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a63d06078c1---bigezuviba.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/91115347254.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/be76ef9dc5479ed2df3d8711ad005948/71545492926.pdfIn PDF document text
    • http://:8080/web-console/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=caused+by+java.lang.outofmemoryerror+gc+overhead+limit+exceeded+wildflyPDF 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_off00018d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D27 18048 bytes
SHA-256: 5c8961a6688603863b0a2bf65b30afad76317393550e4c18328c47315ade3129
font_01_sfnt_off0001bcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D516 11760 bytes
SHA-256: b9d627980921a85b814933a5496c51de1917277c6e57415f9deb056ae554cfd1

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