Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98b8f7d2060912b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 01:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7157cb7b083358b384cb732753f0a9c4 SHA-1: 44419721f3da4cff48e6443995d0cf09e0ece9b5 SHA-256: c98b8f7d2060912b2f8a2eda9dc07707cd3b59d3affc28fdc03c98d84ddb3d98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to malicious content, likely for phishing or to download further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pixomot.ru/uplcv?utm_term=how+to+put+pictures+on+your+firestick+screensaver PDF link annotation
    • http://firewheels.pe/userfiles/file/vewafunipekuze.pdfIn PDF document text
    • http://vinmexindia.com/uploads/toberonanigeregafakoravub.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/josaririxi.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219171114525806.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/vivotodedadetuzedelus.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc7abd472d---zovutalakut.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/pejusonujamaxezokij.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/todexoduroxetujorosid.pdfIn PDF document text
    • http://simonide.org/userfiles/file/vonuvatulexejolanewoziwol.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/78392713492.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/99334499246.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea6e33375f---mudixonipezinikutetilig.pdfIn PDF document text
    • https://ana-jsc.com/upload/files/geluxexulagixexojevop.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/nuduxobuka.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/luwuzogobuliwadomadewej.pdfIn PDF document text
    • https://ikima.fr/uploads/file/11623180785.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/lubizap.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/27035169239.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/32844677694.pdfIn PDF document text
    • http://deauville.ru/files/file/10776357494.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/poravuwuzizitaxelajed.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/kazarezigo.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/80650950610.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414665ab5b0---pikagesujugarowawutij.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/nobupexevakewedepafepe.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_off0000dc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC64 17492 bytes
SHA-256: 50716f43b3178d0f5f48ff69c1a6e6f2091f3cc0d5ac21664c43c145073499f1
font_01_sfnt_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12217 10876 bytes
SHA-256: 9b41275fd0f277399593f645e8a81a099a6626e11f26d8faef2bf9d0bf115ae2

Open this report in the interactive analyzer, or submit your own file for analysis.