Malicious PDF — malware analysis report

Static analysis result for SHA-256 053cf75a31135c84…

MALICIOUS

PDF

90.0 KB Created: 2021-07-31 06:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b6ce70d0a7264a25911b4c0f5f55476 SHA-1: 700846ef04b0e8ec0226f215d3c1aabc480c152e SHA-256: 053cf75a31135c84ea1f159af51069fce084fdad51e8d79945a90267418d0814
156 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. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these indicate attempts to leverage SEO or compromised infrastructure for malicious purposes. No scripts were extracted, but the overall structure points to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://crysiq.ru/uplcv?utm_term=radial+drilling+machine+parts+and+functions+pdf PDF link annotation
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c23d4ed7871062b547e5c6e9b30dfa78/68433037552.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/qcf4nj0u2a3i6cmhml8pacf2r5/golatenoniwaruvet.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/suwibizu.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/35857976938.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/64606602143.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/69832d5033786fff49c2891a2be24db0/mekubepabaridip.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/70662919402.pdfIn PDF document text
    • http://cakenepal.com/userfiles/file/xijuridafojozo.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/vesikonepel.pdfIn PDF document text
    • https://wineart.online/userfiles/file/46946305375.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/c81b4vposud0psp9u4es4vvv3c/91482594109.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/kipuwirifalafakosinum.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e6a291533---27020183899.pdfIn PDF document text
    • https://tl-systems.hu/files/files/nadamarowabobuk.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/vedonewebovi.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/ea221501d805bfd8ab52338758a5b73a/71460186857.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/717e6a2bf4f7a8394a57bf12c2b4cff8/nebaf.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6936418b40---18869736446.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d8894b3db9f846df60b88cde83473311/sariputim.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160852da092c05---dajusojegozekiviminol.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2a7680acbcc4431621fa8bee39e1714b/mipefemi.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/wifute.pdfIn PDF document text
    • http://askort.pl/Upload/file/jasivusati.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/gerev.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_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 16840 bytes
SHA-256: ee9dbbe4b02266b618cffb4f02b770859627b78f01e45e5f6478874e3d816381
font_01_sfnt_off0001270d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270D 11212 bytes
SHA-256: 5c917e017874d0ad925560c4e46b8b17da7544d4e41b9dbd04a6dbaab4db6bd3
font_02_sfnt_off000140e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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