Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be909766c9477ea…

MALICIOUS

PDF

104.0 KB Created: 2021-07-22 11:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bc8730084c22f73dcca6fef9756ecb3b SHA-1: ffb4e01f0f71d64b80ca034b4eedec1a22f5fe71 SHA-256: 1be909766c9477ea3dc98f0f56ca050d5809b78b0ec52ed5833eba2533ec3cd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, with several pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm used for redirection. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/gudimotijadarus.pdf In PDF document text
    • http://ytlcases.com/userfiles/file/58155079306.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/70425625698.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/36548994455.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/siwofofejanedemuna.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/vikenuvisamuxiva.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/57886974052.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/nf10880hn264i2l5r771pfsntl/55645757303.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/lc8c76hi58ug1lkqd4636hb9lq/93429090704.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/pagamuvonidojuxofanapumut.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/61e4bd5b7b20640c7c66c42f70e76774/95290504315.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/48009027103.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/lepat.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/tokolezofifikoputenagomew.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/xonaliradop.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91ea9e68e2---24731357289.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/famoporidimubanovubitop.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/77108136010.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/8eea1aa9896c4e6392f7e2be7d130906/52285069593.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/38087705210.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/61128297183.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609841a025789---nikafirinowogonimazoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=maynard+operation+sequence+technique+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_off000130bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BC 17696 bytes
SHA-256: 5f5516e234fc87e6d36eca3a1a15b3c74f782cf896ce9bada3626179080cc48f
font_01_sfnt_off00015f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F9D 11024 bytes
SHA-256: 19600e01e8f33d41374218719899551c8325ef718d4fc1d45b2f5059797527a7
font_02_sfnt_off00017901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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