Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba03e924fee073d…

MALICIOUS

PDF

76.4 KB Created: 2021-10-04 04:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2b9503e546667e80103645813b2b59a4 SHA-1: 22c260c6189811cd15c77ed9337036de45e14438 SHA-256: cba03e924fee073dc7eee383ba4fcd0f7a569ff9980258ef43e84f1a7a26c7f3
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous links pointing to various domains, many of which are hosted on compromised or disposable infrastructure, suggesting a link farm or phishing lure. The presence of external URIs and the ML classification strongly indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://irlanc.ru/uplcv?utm_term=lk21+the+heirs PDF link annotation
    • http://mirai-kankyo.com/userfiles/files/sadazetoboju.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/jipedilitikibekuwuvo.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/92982644688.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/73812224101.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/bepotusamilusikasa.pdfIn PDF document text
    • https://hse.tw/upload/file/kobepemuzekatifu.pdfIn PDF document text
    • http://carywinslowlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76639674871.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/xurarejudanunedamubegused.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/75118131788.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f37b937b01---kamenebexevexi.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109210104436606.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/gidizuxerelikid.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135294568bcb---puzitajilapizonusomubuza.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/28013542486.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/betejadazevavigizavegexe.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/sunejotipuzerupomiwitafe.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/mukerazaxemafapi.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/fuwujuz.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/22699134342.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/52375045924.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/52177685960.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/3minv7j38sj7vfnvr0keq7vq5l/tusew.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/xigepiwuk.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/tofepularajojajilaxomub.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/paruzis.pdfIn PDF document text
    • 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_off0000c3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C7 19044 bytes
SHA-256: 2485088be11dab8769985fb461824ea2f640f6dc31d1d7291c0b94cd20d53f7f
font_01_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 9996 bytes
SHA-256: bd4da41a79f6b4392585e22215544da1d0de68e15d7bd51d23e6136a3d928279
font_02_sfnt_off00010bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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