Malicious PDF — malware analysis report

Static analysis result for SHA-256 874a3ebc6233c751…

MALICIOUS

PDF

83.4 KB Created: 2021-06-28 16:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 029970bdc1dd36cbc82eaee179c4ecde SHA-1: e13d1d0f10502ad81bdc53e88edeb031abd9a651 SHA-256: 874a3ebc6233c7512b89f1cbb2738772dd5207d95519bfebcaeb53a57f3c3e70
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, indicative of a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. The presence of multiple PDF link farm heuristics reinforces the conclusion that this document is designed to distribute links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://transfertrolley.cn/d/files/dirowojafigenizun.pdf In PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/73751e4e5f115c62a1f298a3cd169df6/zafulifubagijewojutowo.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/pivoxaboti.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/70820161714.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/43845834411.pdfIn PDF document text
    • https://asiabiru.com/contents//files/11539649983.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/e7c26c2d25d51c378489bc0a85defe20/35527863292.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/240b9e677b13aa6bc24ccc6a7bd06f3f/74130112764.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/q1slsustb2q011q6ckjmk5igcq/86577627644.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/mekozo.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/256d2c929dba59d377808588cdc730c5/sukamojunatu.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104291815252059.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/sujedewegojatifuzarimofe.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/zukobeg.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/91735612670.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/69160740715.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4603b42214---tetezixewudap.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6d07514a---98642231920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+mastery+of+self+full+book+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC69 16888 bytes
SHA-256: f057bc4018e1bf3f3f49da62637273dbf18b6f8e27ed5ec5333ed9b0004cc318
font_01_sfnt_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001108f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108F 10976 bytes
SHA-256: bb145322d5b033d09c769fdcfba28585cf1c5546dc61bd893b72b109e99ba9f2
font_03_sfnt_off000129df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DF 16368 bytes
SHA-256: 49af513be5584b63ffb3764bee6623887ad08f97da0f4f962e57d3c96009cc3f

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