Malicious PDF — malware analysis report

Static analysis result for SHA-256 48bd3790891e188b…

MALICIOUS

PDF

87.9 KB Created: 2021-08-06 10:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e444ba74c01b328f201816da7898d0a SHA-1: c967d79b3d449b55af964b68aa86b09db1e86acf SHA-256: 48bd3790891e188b53dbbe8d0e6b997e7c08c32c677252747b0e3225ca1b459a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://crysiq.ru/uplcv?utm_term=google+play+store+apk+download+for+kindle+fire PDF link annotation
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/00998803acede08094048cb62d9f66ce/wonegusog.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/lebosixijubadufevixowibo.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d6d4e55df---58837263136.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/23247250069.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ce4ebabda---nimimijodid.pdfIn PDF document text
    • http://bkmjg.com/images/upload/File/zijanusofetil.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/fazurike.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/41e35f4710bb8123d3256918442713cb/1089731736.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e7uv30ps45r7kidqbbpluhtia7/77154809708.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/98701571996.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vffs9v0ff668p06ml3rsqait8l/tivejele.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///mumivotopuzez.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751c580b109---36601871405.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/46561233092.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/boxopulunadijog.pdfIn PDF document text
    • https://raljob.com/userfiles/file/buwad.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/223858912.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/37e75e5641b228c16dc8df07860becc7/9146373671.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/63107559094.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/rtml7lnhbor4nrkv8ahc5jht4m/bagupigosena.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/812949860a8e72aa4850.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/sigezebojatikobubozekudaw.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cafbb3f9b1---daxowemoloruw.pdfIn PDF document text
    • https://brod-plovdiv.com/images/26844001879.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081a4f49311c---41312352669.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/vevidizod.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_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 16888 bytes
SHA-256: 815e6f5ac716a09225250c480b5a6c2e495e014f667032ead058ab264466767f
font_01_sfnt_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 11004 bytes
SHA-256: fda067539fbd4e4e02076b6573ca40ed2896e5a21e20cb4a7fbe1640f9427c02
font_02_sfnt_off0001387b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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