Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8df2fec4d5ceb9…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 01:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ea5474a4804f30b2cefeaa681845a25 SHA-1: d5fe4bbf35a474855d2eea976560e61b2a6119f9 SHA-256: fa8df2fec4d5ceb9903f4a6783a2d56221ff19117dfdba9b9025a52b9cff93df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://altonika.pro/files/fck/file/tofumofowizotuze.pdf In PDF document text
    • http://newgrids.com/userfiles/file/96977953036.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/kabuvaw.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/wopusagaxoboz.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/xuxiwowopomadovuf.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/jepovetusafudojuro.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/86382288556.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/926l9ujdsb9m52ralbh053p58n/75810518525.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee8937520e---roxababopipo.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/gegotisoruw.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/buxiwigufikar.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/xezukimigude.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bafajebunifedixomix.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/20205842901.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/vagovegutukojenerawi.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a5d3b4494a23ebe4835066eeb867ea6c/19412041578.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/kovuje.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/60224201584ca2897c966f270c7cfddb/21145634735.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/segiw.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/nibewejegutagolelibenag.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/xinabovadagav.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-4/20210904040318307519.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/74694896391.pdfIn PDF document text
    • http://rsst77.ru/upload/files/69185235233.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/32136126945.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6011e455fafbc89f6c00ac85540bd0dd/povuxagave.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/35090687294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+animation+stopPDF 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_off0000b762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF79 10356 bytes
SHA-256: 5fd1418c76e5eb579025f17ed53f507c46abd8156ea1398524475f74c2db0a16
font_02_sfnt_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 14484 bytes
SHA-256: 432691473f69940880080d790611f171cebfe6e3a252fb2bb07cc4cf6ca5d86f