Malicious PDF — malware analysis report

Static analysis result for SHA-256 4428aac2e40e4213…

MALICIOUS

PDF

70.2 KB Created: 2021-09-04 12:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e2108f7e59c7ecb767f9689862d02cb7 SHA-1: 11565af1d2129ad5a417391d51f866684b642d54 SHA-256: 4428aac2e40e4213c9bd877ecb01f54a8166d6359958da0e72f80fb50bf49b26
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDFs hosted on compromised websites, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/53660b1c4b6f9d37799c63b70e59b22d/rudasi.pdf In PDF document text
    • http://eprdel.cz/userfiles/file/sanotirojudovaz.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/duwotof.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/k8l5a4tm7pqcc7fbo2kv92rm7r/96882163860.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/ik6cgb1c0ocmojqenv5t06q2pl/22115821234.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/4f9e6f4b4274434cbf5089f8c3a5d422/16138498491.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/fofefebigamiviruto.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160e7665c3ef2a---3314116556.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/47015393631.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/84735164885.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076006c62fe6---nodurejotezitapa.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/zuwakevidukugepizoneruder.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070539c1417c---zopiguzopubuto.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6ee58ab85d8ce9f687eb9d094f0662d7/55519115808.pdfIn PDF document text
    • https://retta-bg.com/userfiles/muxejamedo.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/mexamizat.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/6000108427.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/vavafafuradu.pdfIn PDF document text
    • http://gtshotel.it/images/file/60576086683.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210508/file/25230318898.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/24041675254.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11dd5638f3---xuponuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cao+handbook+2020+pdf+download+south+africaPDF 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_off0000b25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25C 11276 bytes
SHA-256: 56861f21f0d6310f77eabf96a7327a7af38803995ab1e1d6744d8326ae9e39c3
font_01_sfnt_off0000ccab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAB 15288 bytes
SHA-256: f66b71369e62705baf005b2a2cf33567f421303835c9acc86f1140def6cab814
font_02_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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