Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd7790b51a99345…

MALICIOUS

PDF

90.5 KB Created: 2021-06-08 21:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: af3bc7830c6134cb99b45416e7f468b5 SHA-1: ce3752772fd345a6e19e5baae8b5173d3ac6bd6b SHA-256: 2cd7790b51a9934531ec15e7ec14331ada6310fed5052a4a7d55b40356c1c727
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nomylo.ru/uplcv?utm_term=kruti+dev+keyboard+layout+pdf PDF link annotation
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/b9f472b15ad68fbe00c0f0a78f884b83/39719540360.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/gusulowube.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/c06bed81481ef12b9fe4f8e0f6ab2a65/43813397074.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/0319beee617b0b9a0ba18a9f5f769a8c/76761227953.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/5782214926.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f98300bd4f---zaderugivugazirogused.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0f0ced63e---tudupiputomin.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bae3a46ea6---lufiwufezuzegizomur.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c49c1bf7bc---63908979488.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/disuledotisubudiro.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/71973316504.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9724e4c43---2187805610.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf793084ef1---xulasulekugodotenagu.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/javadefemilokunutadesiw.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a18150aca7e---37366037135.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e421be492---47960064450.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/84965547111.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 4968 bytes
SHA-256: fab8d347afee68a3cd3254f7cfa4a054517b03d6756e7e2118e9d4cc7ff4072d
font_01_sfnt_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 10904 bytes
SHA-256: 1fa4e3eab7906423e7da58e4291ff15c3d8d44c47e2d9d7440af490f686115af
font_03_sfnt_off000129a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
font_04_sfnt_off000137aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AA 10928 bytes
SHA-256: 478a91e50e1eddfba8a3a3202544c38b5aadf2f78d8fa02236838fd5993dec04

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