Malicious PDF — malware analysis report

Static analysis result for SHA-256 951bd6855878e8a6…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 15:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e05941a2eeb8186bd8cdcd332827fcf2 SHA-1: 25173a207955e6db2e66cf6fa698e70fff0897ec SHA-256: 951bd6855878e8a66ca2d74efa5fffc2130c503200fd8575a3775cffe99a054c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to other PDF files hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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 https://cructi.ru/uplcv?utm_term=wolf+of+wall+street+full+movie+watch+online+for+free PDF link annotation
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1584b29fd2bd2998a620ae7c7c099ef0/69652815444.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/pesefijonemutizigopo.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/bowefivirix.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091014172845.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9d2be339a---48151061926.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/rogiputojewavip.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/sitiwenirilik.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ea74f653aec8ab9b116fd5a32e7497d9/xavibukalorive.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96eeb051f---zofeporatorajepoxuxi.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/mewerubaginekesarexiluze.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-16-01-23-48-60.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/31847697036.pdfIn PDF document text
    • http://skncn.com/u/files/85654699384.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/dupinafusosuzodexowetoxu.pdfIn PDF document text
    • http://cartopack.com/Images/file/21607894704.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/kexuxivililanonikuzagov.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/18109779717.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/senituviwozegim.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/80610056985.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/8063032943.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/xafevatiziradosamafov.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/wibirelumuz.pdfIn PDF document text
    • 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_off0000cd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 18492 bytes
SHA-256: aff901fc739a6b3001af78efb067e8e48d119810f5274b69ae79c5e8ac9fe8c7
font_02_sfnt_off000115ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 10844 bytes
SHA-256: dd20f553b9de87e3745d2502698ff7ae915cdd77a4a63299955e67c9f88068d4