Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0da11e6505af9dd…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 11:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2c359b8deb2ed0b9c34db5cf23f6df79 SHA-1: 6452060155b1022ce9ea8c07eec3e88918e27e87 SHA-256: e0da11e6505af9dda05a65aacbd9ed369908da43a69a3c7c7b5168e1f08a23e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://softtox.pl/new/userfiles/file/mijere.pdf In PDF document text
    • http://vina2002.com/uploads/files/lesuwisu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16148c96897656---mijoriwajizituda.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/sisefaxizuxuzuxuvotik.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/73944409740.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/88364989420.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/juzozagofib.pdfIn PDF document text
    • https://value.ae/userfiles/file/52569819194.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/rewivojewukaserufagodoze.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/lubibewaxorowapodo.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/pexurenetekaladajikudo.pdfIn PDF document text
    • http://agavietnam.com/img/files/wuvasuzugot.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/1676979028.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/xibopulatuxugivoba.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/73086934472.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/fijamiwekawi.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e5a5fb9b58f85cccdcedffd743984eba/71297919360.pdfIn PDF document text
    • https://qnzar.com/files/89591962997.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/71499719639.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/7177631597.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/12368716117.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613507bade9cb---80956718891.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/wuvujisasufimedixovaw.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/90933227886.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/45181800194.pdfIn PDF document text
    • http://enewind.com/pliki/file/64885811359.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/zixix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+keeps+freezing+upPDF 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_off0000b62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62E 10600 bytes
SHA-256: ae0f568a9db41dbeb6a9959bfbcf9510634464723b25c97d4b9f50afb54912d4
font_01_sfnt_off0000ce5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 17120 bytes
SHA-256: 698f6edbdbeffd180d1413d4b210aa3dff9faaf835cd7874c293790590dcc96e

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