Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba49e8f39507c14c…

MALICIOUS

PDF

88.0 KB Created: 2021-09-10 17:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a33080c5a5a40e39d833a7d016f8de4 SHA-1: 3e893ef26bfb0e7c3957b5ded1f202675ca54cba SHA-256: ba49e8f39507c14c38f6daacacf04ebf1f8df646d2d294f4ee1f8eeb10bb3d66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host or redirect to malicious content. The presence of external URIs and the overall structure indicate an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=watch+mortal+kombat+2021+movie PDF link annotation
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132630dc91d0---jakopojemetexupovuzug.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/dirobizamuwub.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/92999416336.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386fb248a02---97972684440.pdfIn PDF document text
    • https://tsolisp.com/files/file/palaj.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/87386367907.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/73996725118.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/xutarefor.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/semuw.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/mojugojumozuwalapaxexig.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/22380149025.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/zugoke.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/5009257990.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/84743476524.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/26827794082.pdfIn PDF document text
    • http://yuli-china.ru/d/files/vibozavosik.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/98725044980.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/fikexeme.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/976af06df74c9fce3f5b5e1c772af6c9/91615618008.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161314b294c480---gufebokilawemigupatufono.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/maparifikuw.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_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 18940 bytes
SHA-256: b09519026d0274cf394c9577bc84542d650c6b930c02d11c19e7964438971a68
font_01_sfnt_off00012145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 10808 bytes
SHA-256: db9ed2ae49bf11c0c9b69069517f56762c00088c5b3568b266dab739e51d5c68
font_02_sfnt_off00013a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1