Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a7586ea1a8b257…

MALICIOUS

PDF

128.0 KB Created: 2021-07-01 14:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 22c589cbd9c99b1a7def98896bebafff SHA-1: 7a32837ebcc531eb2ae5ea9544b12ba09d4bf22e SHA-256: 43a7586ea1a8b25711f1dec3ffd4a88793fd09ffb69652d6eaca1a0d1292bafa
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification yielded a high probability of maliciousness. The embedded URLs are the primary indicators of compromise, likely leading to further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9549

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 http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b52c295850---86892091996.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ccf885592---74355247225.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/pivonipenisime.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/8e59c824d5b03f0d9b327995704387b8/22865909752.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a99ec7c8e17---gewanuj.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/29920567016.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/5a34m3135u7t13egjg5horou5r/bowuw.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5440807203534aefbe765a529e9384f6/nivoso.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608577377572f---wefofajowejupumupexe.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/54210585444.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/1872809c22e583250ff78cffc18c0c7c/wozazavesorelononidoduvi.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786b288dd3c---suwaxenig.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/zivigudas.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1181d4900---wenarunibujabufo.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed59004b00---newovirisapedo.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/r755kj6ps2a2kprhrr0f74ced9/zemule.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/dokidelunewimidobirobin.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/xogupigiw.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/b4ff503092c526510e6eb9f3b3346a1e/63059904600.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/jabuvisol.pdfIn PDF document text
    • http://calisnt.com/uploads/files/11348071822.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/tukesiw.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/96459409886.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210624_225632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+definition+of+gentlePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001626a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1626A 25212 bytes
SHA-256: 971976a85381768ccfc9abf8446df46ef7dca9493128559be8d14a3868a682d0
font_00_sfnt_off00011d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D89 6488 bytes
SHA-256: 8f68944f8c70b8e5abc403b3703623795f04c2c2e6565ea38752b7d100a515b4
font_01_sfnt_off000133ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C04 10164 bytes
SHA-256: 0755a5851a1554d57b18a7c033f138942e09e82fb2b7712c2ccb13500d8c2356
font_04_sfnt_off00019133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19133 39636 bytes
SHA-256: 495307db6d42c732276660f44e45398da12065bd44be42be05a5970e72a11436

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