Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac57ed4c3e60711…

MALICIOUS

PDF

69.1 KB Created: 2021-10-02 22:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dee915859ea42c8618484d8822c4d171 SHA-1: a3f3e32fa0710e1a84971a80af7cba8b8e493e4b SHA-256: 6ac57ed4c3e60711c1c5f932408f59f435c54e480ac16d25f225b58de736cead
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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 http://studiogeologicotrilobite.com/userfiles/files/pegakudazaduwagigowutada.pdf In PDF document text
    • http://talesma.com/E/file/80340218655.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff05b8aa99---20622899369.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/pibitogedadim.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/gedomimawalimisagarojil.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/pjif9nvrtljtoffanapqrhu634/93774524873.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/riwedanitez.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614547a26666d---51838681674.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/pudasa.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210921041727_491247422.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42151898d---65863797837.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/nerugoguvagibitasososuf.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210902201657.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/39084777065.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/ludafaxasebemotavitudu.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/69479405081.pdfIn PDF document text
    • http://metapolar.hu/tmp/54183777510.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/23758667157.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/nodixafikuxemodajizin.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/93096566018.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/30195272829.pdfIn PDF document text
    • http://mobil-tech.com/files/jafidewomozagovemazezake.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/nimozumalawam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=perfect+town+guidePDF 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_off0000b182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB182 14856 bytes
SHA-256: 7347384706bdc25f76c391f07ad3bdc66e40884e89b7abbe98a9571fa4dad6ca
font_01_sfnt_off0000d6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 10460 bytes
SHA-256: b4eb70d510cb306f3017a12ba71290f50e617f1bbe11f5013c49403edb12acb4
font_02_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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