Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9cc3c84a4a9505…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 12:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 174daf028548c92124b70005098397ce SHA-1: c35cbabaff4227e97eb72bea56eb94b396244256 SHA-256: 7d9cc3c84a4a95057c93ab06f1c208d06f159982c4409e250fbd7f74cb7d4e66
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm designed to distribute traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ylwlgwadmin.ylwl.cn/upload/files/24787232186.pdf In PDF document text
    • https://funke.be/data/file/55010496712.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/xasewasovurakuneve.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/moguposuxigalimole.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/vamujafuf.pdfIn PDF document text
    • http://www.77ice.com/upload/files/gakufugesibadix.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/fejoxiguwetijemebeguzarix.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e137ac40cf6481d7fcb463b624b6c00d/wujipipibos.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/katosad.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/29299841031.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/gibezumisupokumu.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/19624102652.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132cf3c5a981---74945376090.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/jixizudov.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e3da93a471785c45b3e71a07fff4b20e/batukoba.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/wunemaxafoxuxuranupasal.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/fikikapuzitewijetitefip.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/95417663986.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210917161219_2034411661.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/lawutadikezes.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/24512083888.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/todepi.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/44867624376.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/nitubixep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=one+bloodshot+eye+no+painPDF 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_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 17948 bytes
SHA-256: 81e1c316034e672a1d54c0b58b90ac0ae326aa2ca2947fc1752599730af1b8f4
font_02_sfnt_off00012355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12355 10668 bytes
SHA-256: d17cc25badb6168106819f8f3ff2d16bdb8c1c7d52d86ff9af93cc8a2d5b48f1

Open this report in the interactive analyzer, or submit your own file for analysis.