Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ff61f91dee343d…

MALICIOUS

PDF

150.0 KB Created: 2021-09-03 20:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c7d1a851f3fe8c22c59675cd17930bf SHA-1: 5299e4c2d6f33e5c1321a9358f58b0f77c5ba48b SHA-256: a3ff61f91dee343d569642d834dd23985f6757cab83859320f47926bab9dcc6e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used to distribute malware or conduct phishing. The presence of multiple PDF link farm heuristics and a high ML score supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/rpfomobuu9qm6isip4e923h5r4/50005910815.pdf In PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/52030404257.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/pomopopenijek.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/90191476307.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16094b943e1cc9---gowapofapubazotoxe.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/44147468502.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/puwep.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bumew.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/9304996666.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/33484520664.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093756960ed9---jofabijafepekukeko.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f6484e8a---87281781763.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ufr2q2o4i1an87m6jdmk8cjc0i/45352511771.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/10259539934.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/mepuposozowipo.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/8646666392.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///6015920450.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/lewiruzuluvotebevefelewiv.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/95208701337.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/17708437253.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41aef04541---86789227683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=urdu+letters+worksheetsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DED1 10272 bytes
SHA-256: 538b9d2a423d8ca123129d41a84d1049cd3f4005dd6dce9327bc23ce33fa832b
font_02_sfnt_off0001f624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F624 23872 bytes
SHA-256: 2b6dfe48d69d2d0b6ef7d947aa32d69eeef0610e6953cb2072856ad681fa0008
font_03_sfnt_off00023410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23410 16236 bytes
SHA-256: d31dc96a7107996bc3cb07ff18c19ee30afeb02a4344526f6436ee06464bcd42

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