Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0e955b042c33e13…

MALICIOUS

PDF

125.9 KB Created: 2021-09-03 19:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 948281fbd10634e4152ab5258441e414 SHA-1: a680842088adb20d5cedc81fa8903a844175ffac SHA-256: e0e955b042c33e13ad4d1ba0303f16ca905d8151b65564f5fa69cdb63e995015
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. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised WordPress upload sites and other disposable hosting domains. The document body is unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cjandjunemillerfarm.com/clients/75830/File/dudodawaxexetezofoseka.pdf In PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f283a98e2d---82628850141.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/39568754650.pdfIn PDF document text
    • https://mihalex.by/files/files/taxepagakipozigag.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/kigubof.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1107b21257---89759455886.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/jidegisodu.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/53280709744.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/niwifefefoxawixo.pdfIn PDF document text
    • http://dsagco.com/Upload/file/43189987684.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ak08kohm3c27p47a91db761c6r/52362751675.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/30968c83d764aa77b8ae4446017abd0d/bigimab.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210820210010.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e8b556011---51704447676.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/41362190215.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ee33c3b83---domigenolavif.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/63379941041.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0aed539419ceeca9875a3ee02615138f/59093278083.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/0335720ea5bcdf94df23d51195582ab9/72765667771.pdfIn PDF document text
    • https://airbays.com/userfiles/file/vedowobenimepexusez.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/sotadebakibuf.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/3025699a6f2c8472d382532644ac28a3/46947920875.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/20dcc6cb12828797f72806f2208db49d/zebufubobedowinanetisi.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104f306d4a54---donepomitikowanijenub.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/06c574a3759a736560c0e4d7ae6e904e/67418214425.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/86007173972.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210529_131815.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/petamew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=software+house+istar+ultra+installation+manualPDF 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_off00018a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A2A 10740 bytes
SHA-256: 490b17b492012056fa8fdce3baa3619f39c60fa596c54347ef0d60c9fc69c133
font_01_sfnt_off0001a2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2AD 17872 bytes
SHA-256: 02e196fc98737f5275c647642ee3f4065ac78b77a4853213b7d11339b4af9f7b
font_02_sfnt_off0001d0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1