Malicious PDF — malware analysis report

Static analysis result for SHA-256 408dcddf6d581c8c…

MALICIOUS

PDF

85.4 KB Created: 2021-08-07 12:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: a7c80850920977d7cdd42969cd892eca SHA-1: 4d1cedc1ad38dbb9512752355a7648526b46d655 SHA-256: 408dcddf6d581c8c64dc180ea5f8a4831c8da455fca4b845fb5dddf281926403
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://burke-gallonfamilyreunion.com/clients/28163/File/50513886288.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609216797725d---43606442243.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e8fe8caa3---5557654275.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/silanefonadusefo.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/89759545030.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/80e8bdb008deb5e9ea8a02d54af4cb8a/25551496073.pdfIn PDF document text
    • http://afslab.asia/upload/files/13792194475.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e53b618a---kiwevejor.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/346df9522cb6f5849b5dc4f3e04a5e5b/17427730912.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/pezojafixozaduzimom.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/sagitaxekoger.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210515093918528305gwxbv4.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/38894584790.pdfIn PDF document text
    • http://sun-eko.eu/files/file/50033311677.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/15721518397.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/15506991017.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/nasatiwokixamu.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/pegoxuguvivuwufaxurakakam.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1af2d4f305---dinemuvidubive.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c5932f6c---pimixorinijivolobo.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d7420b915ea0d11d74000964a346494b/6327138916.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210731_54B24B82E7F0BC37.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4ff946b03c277242fb009be19d5a96e0/zutarigakosep.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608356e81c16b---sufotalov.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/qku57c0tka66tq79oabf2t6i2b/dagugazesazaromazuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=solving+rubik%27s+cube+steps+2x2PDF 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_off0000e8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A7 17376 bytes
SHA-256: 485dc1843f928c5613e82104a9fd83b176d4d0061c1b575809c4aac8d66dc60e
font_01_sfnt_off00011608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11608 11116 bytes
SHA-256: 05f188c793031e731440a456e378b0d89e0780eb0684afaa129a79ef4421b1b5
font_02_sfnt_off00013000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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