Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52e14f13f6dcc0b…

MALICIOUS

PDF

91.7 KB Created: 2021-07-19 16:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6621c8cfd90ea2e7cb0ac475a430735f SHA-1: b9fd56419efc346b409d4ddd6d1413c98128aabc SHA-256: e52e14f13f6dcc0b6b05d02ee61cb751e8c0afe52868796311f753077e4f0cb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to websites hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports this, although no scripts were extracted to detail specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/a62aaad909fa6529658f1fc060474c9a/nakikasusad.pdf In PDF document text
    • http://gallery4walls.com/upload/editer/file/34445000946.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160edcc83bc5f6---zuvujosixovow.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/38e775565db46d01f4e0bf5fbfa423ae/mexakunofu.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7f69c4fafc8c0652d358e6c6021e1795/1189377231.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aadf1ee5843---pobebun.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/dogukigekudokoreguzukejin.pdfIn PDF document text
    • http://m2m2design.com/userfiles/seluvawipa.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad412a16a1e---gapivi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc8cc1b31---17646185610.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86e627e7d1---fekuwimitijomi.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/2071247891.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dee2ed220---nixijuku.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/zigiwodisigogeremaxus.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c742ac34b13---51081557384.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/9234d4efc3acef71bc2480b614335eca/28981681106.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e982ff53e56---22319007211.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/jpnu8gk7qk1hfuku7tg2lnkpo8/24217735528.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b35f598c48f---lebetudevibuferox.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe36e652d0---dodurovatijafomeweba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=appreciation+note+to+parents+from+teacherPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 10680 bytes
SHA-256: 8ff51cfdcc468a3462946d4c5f9f79b6e65a9e2eb64d32243f65a3fc156f3cf0
font_02_sfnt_off000120ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FF 16308 bytes
SHA-256: 04b4e0f3701ac767158cb46847d3f5380392735efe5ebaa1a19ffbd66b7fa1c7
font_03_sfnt_off00014b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B21 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58

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