Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c3d0e976d259f4…

MALICIOUS

PDF

86.5 KB Created: 2021-09-15 13:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a85986ec4443865b2b2b65a2b92a059 SHA-1: 497b7fac9b5d52f59c692922d869cd339f9d7ae4 SHA-256: 48c3d0e976d259f464c96649614b970479e4f0e7188f15a12128216a964e52d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs and heuristics indicate it functions as a link farm, with several pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=virtual+sim+story+hack PDF link annotation
    • http://udmvdpo.ru/images/files/71912738991.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109031531033931.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/teniwa.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/9688652807.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8cb4a0fb00188f0d74317ca4f8c93b52/zuxoziporunedetugij.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d552faa9df---61273657619.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/xepumopunotuwiwejaxobux.pdfIn PDF document text
    • http://starma.pl/files/file/lelenufifajuwakonuninow.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/nilan.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/81624802164.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161400826af186---katirizibebuxatisagumiz.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210911222859.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/fikuzumelobunik.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/11730652919.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/nuzorulosojofedulifu.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/68537153583.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/gawafekifoz.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/21356275195.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/7848124981.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/sebigozala.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/28697689302.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/99829306970.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/zodawazokejoj.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/xasejorowesonuboxok.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_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 10536 bytes
SHA-256: da53c45b23c9c91c2ddbfd6dcd38320cdb692ec5b9602898de655994b7447513
font_01_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 18876 bytes
SHA-256: 5cf239e381e38f36560c5f55b0e0abd1cda75ada76873889304528a403286b0d
font_02_sfnt_off00013483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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