Malicious PDF — malware analysis report

Static analysis result for SHA-256 5058b15d724f56be…

MALICIOUS

PDF

88.7 KB Created: 2021-09-02 05:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c3e94d5a31783d1bb4c88f9d9c91d52b SHA-1: 95287904ab5de5103c3467f81b4d47d8c74a14eb SHA-256: 5058b15d724f56bee3961a7340bd91feb7af6eff75091baadd9bb45eb65df8a9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of using link farms to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/8b25lqp2ovccnmbem1tbubnpuu/70538157608.pdf In PDF document text
    • http://didula.com/img/file/voferijezatadinemajonu.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/zaviw.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/154d5cbd9376af8706f78c61842f720c/47576519870.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/76e7a56c6ae364e91c86786a6fefcbd4/8030040112.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/rasewazexera.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/barezod.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/14783342674.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/7108b48398b5f28dec4bd91e851b1d75/geweduxemigol.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/xugalez.pdfIn PDF document text
    • http://esistore.com/userfiles/file/23395494025.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8c3d322aa---38044974612.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2649d69a51---tositigimekumoji.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/n6k5bnlobhs2639v3uf90t3nug/93986566900.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/batanagulumekajegudegu.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/82607191760.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/werifilumolivirajetomoru.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7ccb21052---90117761621.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609884829424e---59218219268.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-6/20210706234208129897.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/bj3f6g5ch7dtu6gpnoqihr42k9/86688751651.pdfIn PDF document text
    • http://arablift.net/userfiles/file/sovarelokorewar.pdfIn PDF document text
    • http://www.naruto-movie.coIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=naruto+the+stone+of+gelelPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 21228 bytes
SHA-256: abe7f62f06b30e2f32a23a3fe7a7d7a042fe16ddf7f31d4518e055aaa98080d7
font_01_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C57 10476 bytes
SHA-256: bc2564c1b17bbd4017fb4e7b6fdee84f3a559fba5fde695fbe9c54c9e5e39aa7

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