Malicious PDF — malware analysis report

Static analysis result for SHA-256 35341257046acf69…

MALICIOUS

PDF

84.4 KB Created: 2021-07-18 14:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce08c9288b4615e597b7fc0007b1aaa5 SHA-1: c885a4e2e089b265a914491b6f6be5b087c648a3 SHA-256: 35341257046acf697938d89c32ed7110dbc15f3e6e8234c73f8d78151d24f653
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document is designed to trick users into downloading a password-protected archive, likely containing a secondary payload. The numerous embedded URLs pointing to compromised WordPress upload directories further support this, acting as a link farm to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ae83dd534---fezufebolapow.pdf In PDF document text
    • https://luyenthitoeic.info/userfiles/file/kitanogogulupomuli.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/1230e90bfb47fff10db242fcc411e934/nebuv.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/rurixad.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210624_83680FB88A09DE4A.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/devixiza.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/feboleraj.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b9edbd3aa1b---jakofi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c897ad46425---xovopititavexitiriro.pdfIn PDF document text
    • https://vestol.bg/files/file/lebilufanipadalewasaxe.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748046e174d---61101569673.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/teliwipiguwe.pdfIn PDF document text
    • http://heizler.hu/files/file/69996281021.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/89771987138.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/84cb5e8d7f9444da5cca96a95fe4aaa5/20343471118.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/34418635112.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093c204aebab---miluxadijabefajewizuvuzi.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f131b61af6---52982944100.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/29358433577.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/45267018677.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/rizafifedonufurevix.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46d10b1d8d---gatubunejeg.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/keweminekibafagigo.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/bba52d6452442c5e76e29bc3a9c1bf15/xivudaralemidero.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/97105983481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=4+layers+of+tcp+ip+modelPDF 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_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 10772 bytes
SHA-256: 6ef89bd93271ab0e55b9987f30014d35e6319097cd93263b09de824fca10e6e7
font_01_sfnt_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001190d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190D 16600 bytes
SHA-256: 30e73b141849e9e18d3ee7c21d1d437dddd3e10a3f86f75f9954aa9bf46376cb

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