Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c2d3156773d52a…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 04:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 900faa3b8b87f10db0f0e7f472f0c121 SHA-1: 3afbf96a5c9ba97534c881a0170db6a25e384af2 SHA-256: b0c2d3156773d52a19545adce84932534dadd21949bb8cbf0974e14a4d785eb0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised CMS upload directories and disposable hosting. The presence of numerous unknown reputation URLs suggests these are likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://justforjetscatering.com/userfiles/image/files/ziwikukinojifololofok.pdf In PDF document text
    • http://reguitti-engineering.it/userfiles/files/bamamidudetopale.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136171d06f66---mojuwapowezujinot.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/xemodomabapizafixejusa.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/10107659278.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/45223908544.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/67149932806.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/3c484834cd78abb382b5fb747cbc131f/60949823725.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/tibinurowasinukekawuda.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/jujogetaz.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/nidubexeset.pdfIn PDF document text
    • https://33mobility.net/uploads/files/89799669284.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210903105202_720026251.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/72569132194.pdfIn PDF document text
    • http://ashleymongolia.mn/uploads/files/493887290.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/81129645807.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/16925092032.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/gogudujagevu.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/gljqr5ru2clnn86i1gvm179u4t/85830990438.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/wiletup.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/25100092407.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/tuxukuterowidepawazi.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/xadabajenoda.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/47654631087.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/vufotesobibana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gfx+tool+for+all+gamesPDF 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_off0000b432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB432 10504 bytes
SHA-256: 2f5d1e2bf64e5abfad0375764a2ad32e8286061cdc20e89315e444a542ccf1f4
font_01_sfnt_off0000cc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3B 15168 bytes
SHA-256: 2150872d5912d82334df4b1c3168302b7e5011d79a23b1626d96d120703148d4
font_02_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1