Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79ddf2df7ff914b…

MALICIOUS

PDF

73.7 KB Created: 2021-09-19 12:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0a17c85a474f1edcb5745b825caef01f SHA-1: 257c1ff4ff5e8d85e2c112cc113aa55a4a3c7566 SHA-256: e79ddf2df7ff914bcc6a67a71c106da71e2a01bf7e722d9fc261263c9d7afcfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs point towards a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

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 https://whatshoulditcostme.com/userfiles/file/zotajepub.pdf In PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/35464254683.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/nibafumonukogilarasukazo.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/8538319237.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/36624337282.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/3918064756.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/tamedukilafur.pdfIn PDF document text
    • http://signauction.net/userfiles/file/mevawew.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/buvig.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/nomumowamivub.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/3041658534.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/77700438561.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614239399131e---83494012955.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/75738938166.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/74603927648.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/puloxovodotimunatuv.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/vadarivolejoge.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/zuluwalupevo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139dab7d7cde---gofala.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/26170753559.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/duqnne210s6p7fj692ap8me83j/99890594176.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/mewebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+unlimited+gems+and+coins+in+hungry+shark+evolutionPDF 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_off0000bd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5E 16208 bytes
SHA-256: f9ee9aed15d64dc266e78d29aec05a64dab3bd5586ed9af106ab7ef83d79024b
font_01_sfnt_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 11268 bytes
SHA-256: ab3ae1dacace56e062536447c95e000d4f60baacea76d5e968d0cc305b32290b