Malicious PDF — malware analysis report

Static analysis result for SHA-256 2045b1de932ee47e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-06 15:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51c749de879615a99f62ca19ff73c2d1 SHA-1: 69d7a33dfed0e0e64a80e651fc4b9b80a4688574 SHA-256: 2045b1de932ee47ea93f1dd734728a91a00f73222fb034ec4ca4826b826cc7f3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. This suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://sten.kr/club/data/userfiles/file/20210730021552.pdf In PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e83c8684a6a---virofapu.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/h0nspl6gkamqkn8i58q637jn47/lojoxes.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/38543032300.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/14aa189e75e333ecc10ff6b60fa72e06/78784158966.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2944a6def1---motuwelitosedogud.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/litobesajebosenufo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdae00a0e8---80341498451.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d906025a544fceadb9080cd70cbf55d8/31019399628.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/90878384885.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608678ad67efe---kokosiwimebo.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/xikituzabuvesumam.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/dunonamejig.pdfIn PDF document text
    • http://rsentco.com/upload/file/zojovavilugiferidaxalame.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/92413116897.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071205198655---tevopokubakuxupibuzigu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc7149ad5a---folobogoxititot.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/xexebotij.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/vvbaedv9d421frt67uk532obgk/31788586397.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/murepedulonobovikeki.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/24922588219.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/165cddd6feceb43d5c12c8a3461491dd/soxebome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=kinesiologia+cardiovascular+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_off0000c299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC299 17356 bytes
SHA-256: 50946c58a974b2c6062e7d1b5848441ba105b8a8d64ffebd38f3a7e2238f171a
font_01_sfnt_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 10856 bytes
SHA-256: 77e887644aafe6849b25ac4961d48fd9e4f982e7a0edee543e0c1c62e34fd6c1

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