Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b7e17f7146e42a…

MALICIOUS

PDF

87.6 KB Created: 2021-07-01 19:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 22c1a224d53d63801bc804184e83f26c SHA-1: 96c51587f975633d9e65ba3a9eb035cb894e364e SHA-256: 84b7e17f7146e42a22bb61cef62d8991d68f4fd6804392671e4d9b0cc5fa1c85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf49769e7---73282198007.pdf In PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae5889c04---xivedugelofukafevewilubo.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/78415002111.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/96187575940.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/27075e93b3e5b29beae3a4b11e1833d0/61273357179.pdfIn PDF document text
    • https://avenue102.com/uploads/file/pivamatiziwujinoxaxaxito.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/24e5f0239d62b88bcd45ad0f75062694/19101531411.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/sk85jgve3b2b9joocvm836m9fo/tixewawulabo.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202151292527305.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/51112152806.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/da75773c10f648d275cbf5e8189e9c1f/35344092206.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/78443077118.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/42978388812.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1dda8c561---43910754094.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160868d027b7a8---nejid.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/83055827272.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/k8lojqt2annokvrucola3i8b20/lolumalitezunavot.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8ba115613847cb5fcfa9bfbac5b200a/lotogewatugaxizum.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/gesitunageguwimeva.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160877051e8ea2---jubenunatidigaxor.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4882d1996---favolezoxab.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/momitedenipa.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/koxogobilujanasutofegod.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c688d85c9a7---konewufanosizowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=six+canons+of+paintingPDF 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_off0000f64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64C 16448 bytes
SHA-256: 47e9c3b4eddfac43ed539ba6fae814fbeaf2113b43e1eaaba88596d142907ce5
font_01_sfnt_off000120ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13903 10556 bytes
SHA-256: 6dade5b095be5f1b669e6e5a5b9b166b2296b278e83e9bcb845c155a9fc89f54

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