Malicious PDF — malware analysis report

Static analysis result for SHA-256 27000e9f8cb4ac5c…

MALICIOUS

PDF

89.6 KB Created: 2021-09-06 14:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37aa0f76a9cc5828f336d8fc7cdd7a8c SHA-1: 55a4cd3ee482873d65add958cedf49a306265e46 SHA-256: 27000e9f8cb4ac5cbffec0b467d063b1f783072a1132ddfe63c8ba2621a327d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple domains, suggesting it's designed to lure users to external sites. The presence of a link farm on disposable hosting and compromised CMS upload storage further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://irlanc.ru/uplcv?utm_term=hoover+elite+carpet+cleaner+manual PDF link annotation
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/zarozoged.pdfIn PDF document text
    • https://mmszke.hu/files/file/xozumutotufirasutetijiten.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/tadeg.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/xixef.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/vidogaratuz.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/tajinogipukijaz.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d717f1984a---24936917873.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/xumagemuweju.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4a3b7fa6d1fcac3920419b19eb227397/suxinabavom.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/fomapixomogubimana.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/jelevuveliwibudajupofus.pdfIn PDF document text
    • http://unsersohn.ch/images/file/31009648144.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/vexebegadozojowipo.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/mkg9slralcvelf73o82q1m2946/jidivutebovujesulugegi.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a8dddd50f69d427074f2bd30754745e9/xusuxesuvagolubugatowog.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/merozixubifozeretij.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/vorelinanelatefasuteliv.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b08cae5b2f---kipinerame.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/f2g81smll6b9oavsphqgvr5g11/subonubewikusovi.pdfIn PDF document text
    • http://praguetransfer.com/files/file/vurateliw.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/pejuregekewetalorugabe.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/fubuverizamusudexu.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_off0000f877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 10524 bytes
SHA-256: ef4c8acf1174e5ccc3a62f7a2d1f9d2bb51dad5695a3512d0219070142bbd48a
font_01_sfnt_off0001105f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12871 18868 bytes
SHA-256: 839c8112c80adcb0a7365ff78ead0d98fc2529d805cfa8d0b17588b0b9629e75

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