Malicious PDF — malware analysis report

Static analysis result for SHA-256 819a9cb0bba9a064…

MALICIOUS

PDF

73.3 KB Created: 2021-09-13 08:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 94d05d0bd4a64c6b3475a9afef464985 SHA-1: 13b6958d0807a759311bbd32fb49a200a86269e9 SHA-256: 819a9cb0bba9a0640c99faa4cd2908891deff81e097b2a8223e1101eeeb4b37c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely leading to a second-stage download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=lumii+photo+editor+online PDF link annotation
    • http://marcth.pl/media/fck/file/samuweragugivabi.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/38557615432.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fc7d25faa---93299887492.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/58250c3467fb9ed29cf240a73d5de711/82703843814.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/vidoviselugometebi.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109060107158612.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b92a7d90f1423fa9c6b0fb54630bde10/fawazanivotinuvagudanixem.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/minuxetisakisimoril.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/fabimusizivikupubagolide.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613836c30e414---50001990167.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/78856130779.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348c76bc7ae---66222325552.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109022005008389.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/lagopekasadidenagitebuv.pdfIn PDF document text
    • https://photofetimages.com/gupuwun.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/degunoxalenifixesu.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/sokotatimu.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/72642832315.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/degebejixukum.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/82532416992.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/70879406613.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/19592482174.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/59232307943.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/bakofapasibowofup.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_off0000be98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE98 10384 bytes
SHA-256: 71c69f555de5b2155ee99779f849b230d6625a3f8a3691549b50e33294ab4ea2
font_01_sfnt_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 16432 bytes
SHA-256: 183940158adf70bd3c6a74e8725221e0a93ddd63de730a4fe0019c7f13be3cb6
font_02_sfnt_off0000ffef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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