Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe83446d2aff996…

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 10:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f0aa8f34c34a86769396d47f40d9fc08 SHA-1: 15aead3a408e07e3e38dc0e0f61164f274e50fb8 SHA-256: afe83446d2aff9962993b14e71fbb28135490dc031e6b7973b3e4c626bba1988
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://conomiya.com/images/uploadedimages/file/75329710318.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a10b56407c8---zifokomovorer.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/98831889763.pdfIn PDF document text
    • https://clubon.top/uploads/files/71459490357.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/mexovewamufirusesi.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/dovesoderijini.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/zuvirulalinimedupetison.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/posonuzulif.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/31cc2d3f768c130fe9b9835a8eb4effe/96725777369.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/99163084563.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01381d94be---42396439513.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/22866445021.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/18722046926.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/99d1f8176826d1bf25a6811288427b7c/gebimodipomuwabaxa.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160973ebc5e804---24343571477.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/36744874573.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/5226973754.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f13c3ccbe---bipivopolinebogofafor.pdfIn PDF document text
    • http://isvpro.com/custom/files/xazukakoje.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769acfc077d---jakesobavurizuni.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/numefozidilevazebomaw.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/86703678115.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/bokiwatizudawibusij.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/buxukazirufebudituduwegu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161127b595de70---80451955895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gaya+lorentz+pdfPDF 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_off0000c989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC989 17740 bytes
SHA-256: a4d539514680dbb5afdbf02746f4b1b85b86db8ef0dc7d4e793c3290ab4ed10a
font_01_sfnt_off0000f7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C6 10444 bytes
SHA-256: 8ceccbfdcf646e584e3bfe58a6c66a370bd6f084bbbb88c3a34ad1b387aefeac
font_02_sfnt_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1