Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1d2a812dffbf9a…

MALICIOUS

PDF

215.9 KB Created: 2021-06-10 21:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 19c7e283ab97ef78bf4c1e3f1cee1c40 SHA-1: 4fbd12bd4122e909ee5fe345262b7eb448fd2f43 SHA-256: 4e1d2a812dffbf9a11ebd3bed56b810e9f88f4aa80a6c44d7a67ff47ddf3fdf5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=al+mulk+surah+mulk+pdf PDF link annotation
    • http://aklond.com/UploadFilesfile/%5C/2021043010192768.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1g77ocus84ieek50tcipaa2im5/mefipudazaz.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210609105046251407fuhpx9.pdfIn PDF document text
    • https://noddy.nu/images/file/91385289478.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608572115226c---gulasiroxofusenog.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083664a0a62b---77823079691.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/0b5742d6682be3cf065c126e2c2e01f4/20677111546.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608af31b207c6---87235470218.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/79035393580.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3c0992ec---30671430447.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/4031d55ed0a95fc7ae2c2aaace6dcfa8/somidibi.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/7e4443439fa917d561da221b0a475b72/xeparujemobokemem.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac99f8d5a7---42138138579.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e285bf200---79659487270.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000317f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x317F9 33496 bytes
SHA-256: cb98d9bdce8fc3d9ddc164066548d342dd4992347b8a3cf953dcb9d0dd738d60
font_00_sfnt_off0002d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D7A3 1636 bytes
SHA-256: c1624c868292407e37b6a73d998ab4dc351f9d8fa6993644057eaa5eccacd4ff
font_01_sfnt_off0002dfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DFE2 5336 bytes
SHA-256: 3f65a2014166dc51905d3e467a957548dd0fbdc4f5b866b4782a019bcbf4987f
font_02_sfnt_off0002f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F1DA 11116 bytes
SHA-256: b52c0caf44d69b9ea2a69131ad5868851cacf0c36e0d27db7f5b7a48cb78bde5