Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec29f1204560274e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 00:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 850c66d516d82f16c4a24e234254fad1 SHA-1: c97ef3d417bbff94b3c6591773bf7305722d42d5 SHA-256: ec29f1204560274e5fe580e6613102ce913e27841decf4767dbb6d29c220ff9b
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16094aeba92de7---nuzufavoligodotozojar.pdf In PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc8e28b92---dagugumexodavegavixuxop.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/68499254878.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b37c15ab0---75018674110.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160baa799ba938---jifamapimorurasemi.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/56469329073.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/mujup.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/tatejunazagoziwawexu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/wedivexuviwezivevizesuxis.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/39634389045.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/5337423762.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161051b2f58b0c---9133142005.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/oooar5af8jsbe67r77hrgob1ih/sevafimotapanofiso.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2eed11c8cde4b02a3487cb91d2f4bd2c/11136137336.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a075916413c---84585128664.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0eb27bcf---29660241808.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/81343599383.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7b7afebf6a1c8a12849d16b4f7485007/23541504444.pdfIn PDF document text
    • https://ultralloy.net/upload/files/80607303669.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/74104548644.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/gafolumixinarupo.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e4ca51de6---50581909166.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611da1198af07---17662533486.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/8c97f1610155444f41343711be0aa34f/niviziwes.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/melijarigozerizuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+help+someone+with+depression+over+textPDF 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_off0000dbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 10740 bytes
SHA-256: 7b70cf4cba1e6fe341eb10fcc79f639d59d5e81a69a4777fe1725b7d4881182f
font_01_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 16592 bytes
SHA-256: d521792b019000e80acd2e661db0c00eec226df7c81ccc96db6d5bbea5fbfbc5
font_02_sfnt_off00011f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1