Malicious PDF — malware analysis report

Static analysis result for SHA-256 541f122ff408b903…

MALICIOUS

PDF

93.5 KB Created: 2021-08-24 00:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 45b8cb6f4cc25dda5679fa4815d304e1 SHA-1: 83a99988c85d131aee7234976b2f26b948e680ad SHA-256: 541f122ff408b903c322f06d34d99ec525b4d0176324fcaf896238787e961abc
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The 'SE_ADVANCE_FEE_SCAM_LURE' heuristic strongly suggests the document's content is designed to trick users into fraudulent schemes, likely involving fake prizes or parcels.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://oniceh.ru/uplcv?utm_term=an+investment+in+education+pays+the+best+interest PDF link annotation
    • http://droneducational.com/admin/userfiles/file/76834597820.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/86242270936.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b412d8b1c21---mexodoletumelifimopat.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/53533407465.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a966c1b2d4c56b3c599a05b7b578350a/11065743464.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/97038699431.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823d4db0034---91399224586.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/petetuf.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/bowafekimikejuxozetugevik.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6b34ga0b242su0e9k02uouon2q/73711631196.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/cc4c16862b59127345216f186c3cdb7a/6300659116.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/pufapajudirudakuj.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ql6ur310fnl6c9v51bbq1c1486/narovo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8f281b5a7---67538554787.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bfb24eb2f---86586713262.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/64720410072.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/79231804281.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210817_A89DD42B7F5D49C6.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/xiruza.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/5656615744.pdfIn PDF document text
    • https://ewt.cz/res/file/jetavegosopetamixuwo.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/44249123086.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210616002852634544.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/nizekekozinilewunid.pdfIn PDF document text
    • http://neonyazilim.com/images/Media/files/20385286004.pdfIn PDF document text
    • http://metallpress.ru/files/35368185140.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_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 17444 bytes
SHA-256: 6bd1b9acf16c50b3ca3af1db372bd706c3e04f61eba5e30cf8feea42c62b7575
font_01_sfnt_off00013609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13609 11136 bytes
SHA-256: 751211c21d17ccee819f177ffb88b5038843266138c6ca486d45439502eec065
font_02_sfnt_off00014fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1