Malicious PDF — malware analysis report

Static analysis result for SHA-256 482f7a43909468e8…

MALICIOUS

PDF

89.6 KB Created: 2021-09-07 07:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3010f0be60611b5609c79feaabd407ab SHA-1: 7d23063f26495a9153a6bbf8ce2546dd317fb9af SHA-256: 482f7a43909468e89aedacb2500db15e13a84b166e9656421e480a6105719dbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. Heuristic firings like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly support this. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://archism.ru/uplcv?utm_term=triplett+model+310+type+4+manual PDF link annotation
    • https://hsse.cl/files/zidexifufopisoru.pdfIn PDF document text
    • https://digireg.si/upload/gumubabel.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/morutofonedavereg.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd9df256e0---2008487583.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/sozokuguxox.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/55113793272.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb06ee3e0c---tawujiwafilajuwededexu.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/jajizogegeruwalajugibal.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b46728e49f8---51359225962.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/48475107176.pdfIn PDF document text
    • http://yongchengtech.com/uploads//files/202108072107598687.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/remipekemeg.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/82716728689.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/84475600353.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/75033394291.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/gj0hteltteanmukg873aeb1iqf/ziverina.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/gedeka.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf50eb25f6---vorujeloguzozi.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/8e74456f369246b025340c616631b54a/sokitofegovorigefelax.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/mujutixajigolasiduvezavil.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/6ppf2kvbqvsmg4i0hb4g582hs6/xapugologubuvu.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/xinimavulizifamirelulobi.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_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 18292 bytes
SHA-256: f0612aba653136d4b52633dc0bd5902c69559380cfa5a9f7fad6dadcfe023a7f
font_02_sfnt_off00013f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F49 10988 bytes
SHA-256: c828ab4f560f5d3bbc292bce161bf889135ae97321bdb307e6daaaefa9ec47fc

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