Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c660bcf9c8eda8…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 03:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab3da96198a9cac0f210180e7189f254 SHA-1: 540742725b56a39bc5864b8ed325c78d7a270f4a SHA-256: 84c660bcf9c8eda84c2d7206e56eaa2a2ec96d1d7797c2d9e2159e6e658d499b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://gs-metals.com/filespath/files/20210907182251.pdf In PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/fopezapanuso.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/68eoafak06t66ei16lromfpg6d/rixotajaf.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/32733394645.pdfIn PDF document text
    • http://mylodge-naoshima.com/88273536804.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/faxarifipozexajawu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d933db05a---28469551124.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/seves.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/jebatozenozafenax.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/43688907279.pdfIn PDF document text
    • https://mahae.hu/files/files/63871216869.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/1664719141.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/i2mree5rmo8g1iafs28loj5bs6/pajigevubezolax.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/39245369425.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/63642397730.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/nerebemadirafazax.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/95535195847.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/gipadujopibepemegerag.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/xudipelepuvizezo.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/29333413072.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/tivezuzejurovemibutigu.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/xubojibizebovolarose.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/14981734457.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090500065773499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=free+robux+codes+no+surveyPDF 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_off0000d289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD289 18428 bytes
SHA-256: 71396f036ccbeb34e4310d0ec8342adf3316142f4a34153f8170108518c4e8ac
font_01_sfnt_off0001016d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 10464 bytes
SHA-256: 48c9222d774db8ab1bb7ec3d7f61d724abdcdcb4a310906ad657690586734350
font_02_sfnt_off00011953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1