Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3b39600e80a000…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 07:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6b6fdf5ec4282419855f46ce576aefd6 SHA-1: 45f2074b48843d0f77513ec27eb81c6bb3536cbe SHA-256: 9b3b39600e80a000b7666c82620b2ade7d4986a0428a887492a51a7e68185d62
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and embedded URLs are indicative of a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/bba851a353665494359534321ae2658a/75281360741.pdf In PDF document text
    • http://iphonerepairservice.nl/app/webroot/files/userfiles/files/ledipebugunokijovesata.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/41553336783.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/40400716577.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/nifosesixu.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///75371753192.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/61332815632.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/bikaferew.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/mijezefowotasonaralok.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bbba02f2dbf---luwitowovuvevedewasaji.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/33135537346.pdfIn PDF document text
    • https://plasy.com/uploads/file/99983037964.pdfIn PDF document text
    • http://storemisr.com/uploads/files/sesiremojajiwem.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/64e5cef4c97fec24855bd5ccf0980032/zosagoxomarobivuzo.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/19617824143.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/478aad1322433b3695268117bcfe43ee/5888060019.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/kojeset.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/9723af825fc8b655a28d2b74fa97cbba/bekoma.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/9424140675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=leybold+trivac+d4a+manualPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d20629e1034---97090830916.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_off0000d52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 18448 bytes
SHA-256: 4db67fc57080c4f8a7a1f4e0d72a03873b8d85aa00f56f3d47c24d8fb4e3a109
font_01_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 10816 bytes
SHA-256: abea0d5da2a34882afd150def296278f98f6ef24f60da1ba2d20c3a50b7585ac
font_02_sfnt_off00011d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1