Malicious PDF — malware analysis report

Static analysis result for SHA-256 99dbb44aba73f4e3…

MALICIOUS

PDF

88.2 KB Created: 2021-07-10 14:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d058adbe2d8222c32d0b555cfe19042c SHA-1: 6f3e42d63c6c5b20fead332651bbc7a6840ba504 SHA-256: 99dbb44aba73f4e3b29f7c1a134076f5c9a97f3d9fbc933390f92bf302d5613d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the links and the heuristic firings strongly indicate a malicious intent to redirect users to harmful sites.

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 https://chcial.ru/uplcv?utm_term=love+affair+after+marriage PDF link annotation
    • https://jxloanchien.com/style/postimage/file/jezofekujedovor.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/nizil.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7fk9i6l3l1fhk37sg5htheki6s/87327042591.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc4f00140b---gomanaxiduli.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/108662344760e2f0100feb4.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f91cc997b---75798276440.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/tobime.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/72137596719.pdfIn PDF document text
    • http://newo.ru/files/files/rikafuvukesufaduv.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/62461250493.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/govulugilebir.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/ae8828569b317599a8ae45ac40e1ae1a/81765038157.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/3120341814.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5df8ddb07---37229181362.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4843a1d24---32392017124.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/49504737889.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/20868767594.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160742f168e6d4---jipidemanojati.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/bukanelobajeberolivulasat.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e6aa783d0d8---45815081606.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/faxiworewa.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/vojozi.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/29968092818.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/7cf2f747c844998462223eaad446ca1e/70426158929.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 17484 bytes
SHA-256: 4af98b0215810d6172b741fd7f6972739a3c27ced8c23351500f37d7175a19c6
font_01_sfnt_off0001247b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247B 10260 bytes
SHA-256: 6c7d4d74a0b8f52a3ec84f5b7f9baa9ad70ded14ffe667a11ad649c0914a4020
font_02_sfnt_off00013ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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