Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e5cc89ebaeee78…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 07:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d370d8d616ab0f1f492a864dd8a20c4f SHA-1: 8c36841fd0c6d574cdd6b2ccbe83fd0e188c9275 SHA-256: 68e5cc89ebaeee78c75c10d02cec52dee29eb7d1dcbf388b2e49b4132b9315c1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on disposable domains or compromised CMS uploads, characteristic of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of external URIs and link farm heuristics points towards an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://gpszone.hu/upload/userfiles/file/75497109475.pdf In PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/13147236989.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/sijuber.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349fff4a063---maragovovarixuwosate.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/25534779726.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/vilagefexadotiwatabadoni.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3c33be59b---rorapowapokipusegibagan.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/31389165279.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/xalekizasamorufetamuvaja.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bffc82946---30344176215.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/gepoxiveruzimi.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/vuvikekivaxitezenuveli.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/migejoluwurejiwuduzubel.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/lasanapupijepigurotuki.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/80000708411.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/jivelezusumifipavi.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/teselibaxapose.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/pitalabis.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/nijovapufurabifupudanip.pdfIn PDF document text
    • https://olterus.org/contents/files/59983646863.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/703923771811724d1adb86530bee7764/dabix.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/memoduwuvela.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210907_682EA43386F9BD9B.pdfIn PDF document text
    • https://pratham.one/file/detukad.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/83436533573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=recover+facebook+passwordPDF 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_off0000d6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 18552 bytes
SHA-256: 30213dae60809f1b5111b949163290b77dd8f2af7589b201430f66e00a9dfe2f
font_01_sfnt_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E72 10704 bytes
SHA-256: b2a0269b5a947c64af54f227a51826d18ce84a454e9e5522c07d9fcbe337d9e6

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