Malicious PDF — malware analysis report

Static analysis result for SHA-256 d105ba455c3b217b…

MALICIOUS

PDF

81.3 KB Created: 2021-06-30 14:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 66bfcfe4bf598587c9803c18203f74d8 SHA-1: ff44919a40de1e9fcf925ecafd1280020a8ddf3c SHA-256: d105ba455c3b217b85edfea7f3483cde057f88411c63902778c8b879d31f5d21
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or disposable hosting. The presence of these links suggests an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://chcial.ru/uplcv?utm_term=download+anime+tagalog+dubbed PDF link annotation
    • http://esistore.be/userfiles/file/12913895399.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/zudetugiloged.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/eba4ffb502e91f709cd430f3162300ed/66054776761.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/55721599901.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983488c0bfa---69319617124.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/5f440243a34965395a2d5b6bf1a10c86/fexukajazujefuf.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/bebapexo.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/35887f9e478cf8ad6920330526a2336b/sazosugi.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/vijoruserof.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/pfff7gqik9ilbjocso24fkedkl/digunixozubewog.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/xarobot.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/50752009421.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/16507638487.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fd4045a8c---30019455024.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607805dfbdf99---67577434204.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/77066833145.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16091b411b9fbc---lajosot.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/wejisilu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160790e49ce4c5---32258123861.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ae3b0c69202d3acbb78a3ded804f82d3/pizusimupixidegepowa.pdfIn PDF document text
    • http://labonscafe.com/userfiles/wuxosolasijebebafut.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 16160 bytes
SHA-256: 5c13cceb9d36bbc2bc20aea0fe1d16ac5c722eae827defaa6d249ccd2c25c082
font_02_sfnt_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 17460 bytes
SHA-256: f6f536664d40f41ae23c5d6a20ca2fc969d7503884da82574c2d2798b487f775
font_03_sfnt_off00011f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F46 10652 bytes
SHA-256: c782ac6ac8a80ff505b5c4bd3f21151d73230b27c07c553a9e8807acc356ad9f

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