Malicious PDF — malware analysis report

Static analysis result for SHA-256 876d9b6d78cb5bdb…

MALICIOUS

PDF

85.5 KB Created: 2021-07-25 20:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e4dd31364793785abf738ac0b1189944 SHA-1: 5275d1fd226a4114cf1604d1121da13ed75b10ca SHA-256: 876d9b6d78cb5bdb084f94fd47534c1275b414a3183b339d4b79a714b12a47b0
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host phishing content or further malware. The PDF structure and the nature of the URLs suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/0dcd0815867d719e1fe31d0fd83bceb9/30530157022.pdf In PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c0debc5a---febakokixalowoponab.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/kudewereroxokez.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076da0fb8019---kuduzeziv.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/gofogejowal.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/kimafigusuzurilokegivis.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c48caae7226---bafujupumenex.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aabbc61d716---79530315243.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/12503607825.pdfIn PDF document text
    • https://bursac.net/userfiles/file/49934534269.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/nawopifizoxizemu.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/gemiga.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/7813762003.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855a4f19cbd---wufobebitamefi.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e03c7f20440---66129277311.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/0f7773adf8ed26ccdba5300618f97d1e/43899774604.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c109c0b664fe1fc65f88a8636f0d9db9/39647377078.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/fd9ad35f6c11fb6f1e1b5f3b29f141dd/21587542062.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/jh1fbv89b1msqemtkaduouhhft/90721363019.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b8fd71575---44176444247.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/58603183207.pdfIn PDF document text
    • http://yoron.net/up/files/5169493436.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887b15e8d74---jagofakamagej.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/19602f2377e85eda928c1409f1e5cc4a/97986103869.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/jubozokirorikaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mxr+carbon+copy+mini+manualPDF 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_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 18216 bytes
SHA-256: 5b09db7916792a6bc2e377e485e25fce75dda5ad7859e238e6e18e36ee23c5c5
font_01_sfnt_off000117d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF0 10588 bytes
SHA-256: aac7034bd084499f29df1617bb0e50e971fa44db0feee6f50af5054efed04deb

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