Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77acb87d47cf690…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 16:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d2463a19545f879d06d6abd5615536f SHA-1: 7de0a85d69ce134841fcb364e17e6a68d04aaa44 SHA-256: f77acb87d47cf690a549dcf8c223ab05ccbf124f06f5fde97d9bfd0b0af487a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The presence of multiple external URIs and the 'link farm' heuristic strongly suggest an attempt to redirect users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/g9rv03vkg7f341qh79rhrevqg2/gipupifidatarumedife.pdf In PDF document text
    • http://bakefruit.com/uploads/files/202109070913409270.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/34993200102.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210906074529.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/93245112120.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/46362152343.pdfIn PDF document text
    • https://bselink.com/userfiles/file/vewidif.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/vuzovu.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/risusupuje.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/383be9c110fa351d3a0c821f1b55286b/73208485952.pdfIn PDF document text
    • https://tworaise.com/userfiles/file/kimusakofetatagajoxiniw.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/51dbc8a85511e8551273b18d5936509f/10006769141.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/pubiwab.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0340d79bf---derifatimatapoduvavatow.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/tugiborefinime.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cd9e9c46f---68216759751.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/72055284265.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/xijurekevimotaru.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/molijiremunatokuwofobubiw.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/zameravar.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/burefumojuwexaguxexupen.pdfIn PDF document text
    • http://demkapi.com/resimler/files/40307039397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=live+wallpaper+mobile+legends+downloadPDF 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_off0000b081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB081 10888 bytes
SHA-256: a4c0451b857e4700f33c58f0765fa27f635dedd357bd7bf130b0d7960b52fb49
font_01_sfnt_off0000c93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14D 15544 bytes
SHA-256: bf8270b9f53e486a25e8c248c227140ae88726e095e66281334779fe1455f56f