Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9012699217c0ff2…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 23:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: be7db1acf69785ad0cb3956e129c55d2 SHA-1: 211e209f9aa8011e4226b6fc9b5df1ff4b095ec9 SHA-256: f9012699217c0ff2c01648f90bce33bf2e7bdd030867c8debbb9f748b402dc62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware, leveraging the 'PDF link farm points to compromised-WordPress upload storage' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/dlaegiafidmevodibek70hd05u/74452523486.pdf In PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7ed398220c079f1006c2e71b22040781/70525962661.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/57952734236.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16143c59bbebc8---xukaje.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/11071380507.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/66215354494.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/fomovedevadudoriwux.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/lakuxoribexibivisodu.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/kopizumokemakerame.pdfIn PDF document text
    • http://adveotec.com/img/file/43052250391.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/34484586310.pdfIn PDF document text
    • http://dakov.hu/_user/file/76421494505.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/24535704115.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/woxaradopekarovosodunolim.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/vojafanakatubur.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/tajowowovemabutixiru.pdfIn PDF document text
    • http://platcometals.com/images/file/pekelifofasanoreki.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/60304141083.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/26639962739.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/15b867be95b56ca16619b5d0a46e7d00/93746006059.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/25203104363.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/setorekekona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=online+games+for+androidPDF 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_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 17944 bytes
SHA-256: c65dc8c774e314a3bd6fc7e493e9923af28e4e3534512f473c774b17d2242f34
font_01_sfnt_off00011760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F77 10624 bytes
SHA-256: 322a88892cfbbdcdb8c248554ffa4181b777258816e3d33a4db7dee5a259353f