Malicious PDF — malware analysis report

Static analysis result for SHA-256 65173f269b2fc98b…

MALICIOUS

PDF

75.8 KB Created: 2021-09-05 07:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f8f425a8dfef492d4176601e8e993e07 SHA-1: d16d2df4ede4c90bd1f61f37d0ac793c315ec416 SHA-256: 65173f269b2fc98bb053c19174132ab89c02914a4ae5c2b0f8f085bef2372d87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of multiple compromised CMS upload links and disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crysiq.ru/uplcv?utm_term=piano+sheet+pdf+disney PDF link annotation
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da8787a94b---76888740821.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/vivamuxuxafumox.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/kojor.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/zajugeja.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde23d22016---24966973483.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///romukizififapo.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160832774e7d25---17622224168.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/pitorodowajizik.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00c9e5978---jemake.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/39174300457.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/zepaligaxuliz.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/sanazixeg.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/45381748893.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/89837770524.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/424a5a01a757a13721e234f7e708a0de/8477987582.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/gufonemofanowifirodazed.pdfIn PDF document text
    • http://charontrade.hu/data/file/zepin.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c852655bbde---67218969845.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/30055527345.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609413ec7ee91---waxetibawepuxi.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/29525108918.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acc8241acf---92752778776.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/xizufikigakoguxogitaduvo.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/61490381954.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607076e4bfb80---jinisufelof.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbac62f6bf---14713177774.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_off0000c716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 16656 bytes
SHA-256: 840b4810db02abac33858fe17b33cb63152d733dfd472aaf5e1e54829774f296
font_02_sfnt_off000109f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 10564 bytes
SHA-256: b20bae44c1f22fb1613d0c3683a420c8b042a61fe2752aa8daa770845f77c4ee

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