Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f90cd7f2bd5098e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-13 19:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 486aef587fdb98d6be3427b9d46348b6 SHA-1: ec86eda31fba644dc5d92dc890817aab224de768 SHA-256: 0f90cd7f2bd5098e8f5e184f3bcd63ad17260ad0f21a9a6e35e9462b4911aeaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm indicators suggests the primary purpose is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://drafthe.ru/uplcv?utm_term=pgt+tool+apk PDF link annotation
    • http://carbontuning.ru/file/73997696759.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/20341254858.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/gazovabovo.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/25852820722.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359717e5ab5---5510451179.pdfIn PDF document text
    • http://sieuthibds.net/images/files/35744775186.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/58153187874.pdfIn PDF document text
    • https://agermag.ro/mm/file/filujulanoxewe.pdfIn PDF document text
    • https://datajournonepal.org/files/85682234445.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/xavidudeworum.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/28233377246.pdfIn PDF document text
    • http://3q1p.com/upload/file/210910184311039127cg0zx5c3c05i.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/90616647751.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/fatogamabob.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77739961960.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/suwezujafasole.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/92027157442.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/55363578903.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/4112990786.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613414d056614---punefuwifilugifisated.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/xumodenaxanu.pdfIn PDF document text
    • http://artediapharma.com/upload/files/39787861932.pdfIn PDF document text
    • http://dobermanncz.eu/files/sajagivino.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613958f044ad4---47998039288.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_off0000ccd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E6 18628 bytes
SHA-256: 9fd399116a27494f9e12d525ad65c2fe6bf6ef2f1f02417fe3b7eb90fca5de4c
font_02_sfnt_off0001160e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160E 9924 bytes
SHA-256: fcb73206061cc69b75c573d31e1a741babd3d92455d8012b45271f4b2664370c