Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47bc57ef966918c…

MALICIOUS

PDF

84.8 KB Created: 2021-07-29 23:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d8a2309f3a9764347245cd83c3f744d SHA-1: 4f83f91d644bf74a505dcb69e2198a699758cd65 SHA-256: b47bc57ef966918cbdb0df31584abe71d9b6b681cfbd262638fab4a43a8fa2cc
216 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a lure to install a browser extension or update, a common social engineering tactic. The document also contains numerous links to compromised CMS uploads and disposable hosting, suggesting it is part of a phishing campaign. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/89a06f06f3d2b5b82a1ddc030530b588/dulegixabajabovugog.pdf In PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1895a9df5faec5350dfd9f5cc7916d8a/mimetewuwuxijugemi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bne931lu4ijecu6gclatk1n037/87881116285.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160be7ac328ee3---wogatijinikotumawukuka.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/zifosawanif.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/32888879691.pdfIn PDF document text
    • http://benrassam.com/uploads/files/66170617011.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/cfe8e458d2ee23aa99ae549a18ef876b/bafej.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/wivewusaxigujam.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/67751989593.pdfIn PDF document text
    • http://riph.pl/userfiles/file/13440093641.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d52677dd5---vuredujurivotajuripekuvo.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083ad5c6f6ca---woxodeke.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/ertnebum7riiqlc7g9s2u99s9b/nigitimisofimeduxijedat.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/8784849676.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/gunuboje.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a0328b4dfb2---92695322115.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/bd5336463b56506e214af4588780a2ff/tosigusizosimetifuzim.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/46204699498.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/tidewete.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/libapexodekopuxi.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/xugijakisunifebepazom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=adobe+reader+free+download+for+windows+7+portablePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f2faed4b3b51b841276f75d9d0311a11/zumowowikekuvurakesel.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_off0000e916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 10748 bytes
SHA-256: ad5cf2865a5869cf4cbb1b27b6579d91f0d469880dcd2525fe85da80405bac6f
font_02_sfnt_off000119e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E2 16964 bytes
SHA-256: 5fc79a40460ba0f5f78084b1babf7e9becd751aa6978a91b94abd857228c4977

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