Malicious PDF — malware analysis report

Static analysis result for SHA-256 902ca3f0204d5aac…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 23:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 770d99bd0a218ecd834c0d003381d271 SHA-1: fbe8dcb67842b75909d06b6efb21dd9cb82f5fb7 SHA-256: 902ca3f0204d5aac0d93eda826ba68ec1a9ba6b67ae1702f2417da9454dac2fe
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and potentially malicious URLs, such as 'https://laborke.ru/uplcv?utm_term=gta+sa+ios+apk'. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL destinations strongly suggest malicious intent for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=gta+sa+ios+apk PDF link annotation
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5246d529b3a1ee5e1e473390bd96a3dc/42888281767.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/32880178012.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613145ba4975c---gukokepirugedemu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/jls2hqnsm46knellh0h6qdptqt/94465350588.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f31d4acda6---91614643707.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0636fbd2b892b903cd33ecb62745611f/birad.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/92399792989.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/gufuzile.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613107d12de4a---23770144280.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/4758416993.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-03/210903173307903944zujt9s8cn8f4.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/gerofevin.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/42970707855.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/juveneloniseja.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/16263454809.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/60420647208.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/4a222b159bf93dff5ab74ddfc950f309/zeraguf.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614034e3ca069---kabulavejapopovogiwexexu.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/92202161466.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/pikawi.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109020513534871.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/sedolaj.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/rigewufubal.pdfIn PDF document text
    • http://axwelindia.com/uploads/juzexetizeropezudad.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_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 9996 bytes
SHA-256: 7c964cf4d980b3686f36ba0fad17f041afbaa2e8a0893def1cc6fd15463f99c0
font_01_sfnt_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 18616 bytes
SHA-256: 9a14a4c00ad211d29f95fb9d43f8f79e13120b7dcd2dbae662edbc489bb6d572
font_02_sfnt_off00012cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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