Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a0c18dabb763ac…

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 13:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a93652c278de11d804ab3d12502208d1 SHA-1: 13fd9a10f20a64c33cda627f83e88d931c8a73ab SHA-256: 97a0c18dabb763acc51e212fe8a30aa126b53c78633e8484b94684b191ce15b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites. The embedded URLs suggest an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wwm-quanta.com/upload/files/87064424912.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/835db6f01aea96e4e29b0842a5b581c4/69234907267.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/3dad372b3f406610a3b8abbe587d62b6/19764513924.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/mopuviketabijes.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/85390058732.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/musejodob.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/84152142054.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/15947510024.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/39255894694.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210628_64FB64DB76CAF721.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b57a72cb6---45833646886.pdfIn PDF document text
    • http://handgun.ee/media/file/fowunufedavokawakozifo.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/kizodegafurofetixasasi.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703e763e6e4---rizapetujolokap.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/zisupimatunedixujatutun.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/puxukutolesurexapupotojib.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/928228444.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/32648574975.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/meporapuriloregukaleru.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/loforikemidigefowedi.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a791815ec94e88c84134064899b13af8/48888367712.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/78995019404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=wow+chronicles+pdfPDF 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_off0000c391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC391 10536 bytes
SHA-256: 959ace5fcda06c468c8c772e1fda59047c1bbd5b1e3cd810ed0bde66c8833e92
font_01_sfnt_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 17420 bytes
SHA-256: c7c1182cb653525c402186b09da00209cc5481cdcfa1503dd8228946c2686f81