Malicious PDF — malware analysis report

Static analysis result for SHA-256 1daaa2484dd0aad1…

MALICIOUS

PDF

80.1 KB Created: 2021-08-17 01:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee74fc8a79c69ce37f8d25d1493c9f0a SHA-1: f7de9cbfdce55bc22e7a82657b1827b1e2e4eb89 SHA-256: 1daaa2484dd0aad130c0e4649c1f3fbe46a22d4267ce30c66b280a2baf0fa258
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host further malicious content or phishing pages. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this assessment.

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 http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160827be9e60fe---70725652411.pdf In PDF document text
    • https://fo-prefectures.com/pages/files/90558695036.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/30894512191.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160721ea0b13a5---53699465071.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/541f662d153102e4dd853b899fcd9e69/34885673836.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/83191904469.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/8891248429.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/lizejanotexetek.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/rebewosomoda.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/17338536957.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/5abd76d1443aa8b93b76f89c1bfcc079/zidapujavexudegiw.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/02d2be65248d6869764c31f3a0428bce/53966610348.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/31c0c6430a70d464aeb126345109423f/4252551101.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/woperuteniko.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/33553598676.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/35154076244.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/90843898312.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/57831540192.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///67281723983.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/52295602414.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/fefirenosajevoko.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/juwaluwubaviroladepawat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+use+motorola+cls1110PDF 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_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 10548 bytes
SHA-256: 2e72f9287192577d71fd9ab049988db39bd5da1d671cb152cc91c7ca5e8a2242
font_01_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 17084 bytes
SHA-256: eb323cb07b3c2d78cbbd833e7d77721626f4f1ffdcef3a5bd1dfec04ee800d88

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