Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7c7f9fa2ecd412…

MALICIOUS

PDF

77.8 KB Created: 2021-09-04 23:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c16100feee3bc2851b16f33bcd941fa1 SHA-1: aaa05b9f89c0dbe90bb8d52db33c76ac89b4d47a SHA-256: bf7c7f9fa2ecd4126228ac361c77b774f14cd8aa2db69df8d4acd40faf81f502
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://pinetreerealty.ca/clients/55933/File/sesufujamukekokiretikomu.pdf In PDF document text
    • http://18554080.com/userfiles/file/xevubizazekovabij.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/60205340034.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/13092063163.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/84793978594.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c66f19d4c547fd4f3617d8264f6e8f07/wufulegaga.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ab603bcff8a7e119309814debda07693/fewijorotom.pdfIn PDF document text
    • http://soudurelauziere.com/upload/editor/file/tezenuxexox.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49ed27472f---44987283715.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/vulolatetirutubiremofixu.pdfIn PDF document text
    • http://cjatkinson.com/userimages/25430330626.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/828b103d8d9adccc4590f8577e0ff6c9/65507735391.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742f447def9---monipobazijadufe.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160948a3a9985f---vamurowugitugetajezeru.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/3604798187.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/7242c6221c5b5d6b33e73a849ec4b0d0/74200999563.pdfIn PDF document text
    • https://digireg.com/upload/8595023020.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160933a35a91ea---69126469545.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319b592f945---desafogepopiz.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/52582674476.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/beminevajasa.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/sakudaxewirosobopizi.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c602b8c56e2---kamadazadurusadisulewal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+the+grinch+stole+christmas+comprehension+questions+pdfPDF 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_off0000cae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE6 16876 bytes
SHA-256: 23b2e8406488b3fb904e93b9bb0e49c7ed7e096d181c8cae702230146e2d0098
font_01_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 11392 bytes
SHA-256: da6395e5bf07e5fbbd6cee0c34527f58a1e6524b723c4d0632f9a17633930cc7

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