Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b8ee62cb8e0778…

MALICIOUS

PDF

73.0 KB Created: 2021-09-07 01:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6960ba29b56903761f1f17c1de8d1b64 SHA-1: f1b51bc346bf464882b6ce96c314efde8047bad8 SHA-256: f8b8ee62cb8e077823447012c8f514352474947e393a1276c3de7436938cb666
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier, containing embedded JavaScript. It also functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites or disposable hosting. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • 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.
  • 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://palami.by/images/file/pupazisigidun.pdf In PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/92fe3a4cdf400844e62bf187fc3f5935/javaxikoj.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/deledegazinabuko.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/55150563171.pdfIn PDF document text
    • https://bursac.net/userfiles/file/mozadoje.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f284ddd15---20655037969.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/plr7rvsablu6vup62jvh54hjg7/fegetusa.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/dbf3be91760eda986a2905e62546cd40/tebinikatanu.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/849414f92e5fa18fb2887689c23662f6/40135125500.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/44395202844.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/xerobobetudisu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160720b77bb832---pimufajevamiravi.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/027f9ccbcba122035fc330a213205710/22273694672.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/nekolozujibujosibuzur.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e6bef18235---nudebinufikafejixubexila.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/27337566634.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160acea3becdc6---68129007401.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/muziwowipo.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/11873053236.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/11557087950.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/18333400343.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/44565837437.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/dfa277a6330bf29f50f6c8c8e2f92c45/bamotexidazoxegafude.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/82784374198.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/guzonabopodejopina.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/rutijuxiwojawepokavefoge.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cc58b17c335---dokesibezaxetuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=little+red+riding+hood+story+printable+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_off0000ba6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6A 16632 bytes
SHA-256: 790c39e33e4bf30e1664ed401b765615293c82b9b0b1f884d5f2275613c34fb8
font_01_sfnt_off0000e50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 10988 bytes
SHA-256: ddf06d46c46f407571d7bf115f4c6b74679bcfe258bf376231e3576acd643dd6