Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1739de1965d5a1b…

MALICIOUS

PDF

69.5 KB Created: 2021-09-08 21:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d551e702d6721a8db1a1436202d7b1fc SHA-1: 9042947f3ed8d44c67fa59a1ba512f12b6a8eb1b SHA-256: c1739de1965d5a1bf28dd4cec8aaa20224d5a92aafa40c61265638ef9b00135f
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic points to the use of compromised CMS upload storage for hosting malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://loyallcanada.ca/editor_files/file/kebikeberabunude.pdf In PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/32711369801.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/kafenubemowotobanozanu.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/natobezifefiwubi.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/rizobabatokogutufugas.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/23291749027.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/45131923679.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4e554202---23853469482.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/47595273179.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/lazotuwegi.pdfIn PDF document text
    • http://plncse.hu/php_data/file/59173642992.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/rakemak.pdfIn PDF document text
    • https://cian.hr/userfiles/file/bavasawukadubifiwiwajuboz.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/79480053344.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/xulutixovalujas.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4e7af96c5fcc4183debb7752c63c2c5b/67377670410.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/2665856291.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/rijutaxuxala.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/89300961591.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/vaxipupubobejaxa.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/95cbafd2248a9a94d37c155ee1ee3642/koxorapegunigavumosavepil.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/daxenazizojud.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/35080727691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=direct+and+indirect+characterization+practice+worksheet+answer+keyPDF 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_off0000b0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C7 14856 bytes
SHA-256: ac07b2627418b719934c351d16ebf3205dfc9907632adbc2993fb8ffe88671d3
font_02_sfnt_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 10916 bytes
SHA-256: 030a70f09df05817fca868dc66b7d5125f498eac3b852240abf2a3b13f4d3656

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