Malicious PDF — malware analysis report

Static analysis result for SHA-256 97211f792272580f…

MALICIOUS

PDF

73.3 KB Created: 2021-09-09 04:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4ce779940a038b921b1e44a1b9b7046 SHA-1: 17a90cc492c48997abcc947bf77e2e1ac1d24068 SHA-256: 97211f792272580f5cd0d05b775722eab166375aba99813ba9bccb65aab9b4e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to potentially compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with ClamAV identifying it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://huanghecables.com/d/files/80481562834.pdf In PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/zavosin.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/tafiferabokovuj.pdfIn PDF document text
    • http://serting.eu/userfiles/files/lujuseba.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/filofazuxo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161371c2e9fceb---58513296275.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/62951775908.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/80281320108.pdfIn PDF document text
    • http://amdind.com/userfiles/file/meximaletikegudemeloz.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-8/20210908172106122897.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/9d54ae876192a9b817e56aefe8ab061a/jetalobefafovalelizujoxi.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/fitel.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/27382261284.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/61908890733.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613521b6272f2---28034046955.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/71229285864.pdfIn PDF document text
    • https://gornjastubica.hr/files/zuburizejexakupazuwe.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/54981016059.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b63e1dffc---vavuz.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/xanuwupidalunejamazoluvuz.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/23752583016.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/dekimusogemi.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109060413530623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=inshot+apk+free+download+without+watermarkPDF 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_off0000ba2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2F 16420 bytes
SHA-256: ab2bad03b9200241df1725ec2dffe8550c915a91fbfce8cbb705836a4b4e0c7e
font_01_sfnt_off0000e40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 10992 bytes
SHA-256: 524dd81a43a883f49770613b957f3cc068d884efe0a2897c480e962fad0c7c94