Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97b2d15d10673d9…

MALICIOUS

PDF

67.7 KB Created: 2021-09-23 14:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d2a2be6cef2278465d0498bd54e3c425 SHA-1: ed6432abd176bca1ae254d56c5d74f214009ef3d SHA-256: d97b2d15d10673d983543af6a79d095f5b7414715a88add31fdc914c59756058
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sieuviet.net/webroot/img/files/sewijajemazapabapo.pdf In PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/65874044991.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca972486b0---xiwodudujodagezoxedunawik.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130354166baa---8158499198.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/38049590462.pdfIn PDF document text
    • https://wmu24.ru/media/file/fagurawavuzorikapasotetu.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131224343f34---muxarugozuwugezarifusasi.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/wejetonufalo.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/48127753513.pdfIn PDF document text
    • http://arablift.net/userfiles/file/kagafubemekorubixamu.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/xebilulapukuramazixiduduf.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/51567886695.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/29714749513.pdfIn PDF document text
    • https://businesslife.com/content/file/38721087607.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/22264830429.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/90722287014.pdfIn PDF document text
    • http://cwesp.biz/upload/file/12008396566.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/daridusizagitib.pdfIn PDF document text
    • http://secoinblock.com/upload/files/71789900763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=heather+roblox+id+codePDF 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_off0000ac95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC95 10428 bytes
SHA-256: 9613990312ac595d9811b02d8b516dc072518251eb377cd08f0da1e32c35c92f
font_01_sfnt_off0000c443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 14828 bytes
SHA-256: 1418ca01d2769c4ee1793a811ea09ca739399d4e3db142d65b70d45e753e5150