Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c11f43a63aabf4…

MALICIOUS

PDF

79.6 KB Created: 2021-08-30 03:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: c11d6e9213b7f58f0aaabe526907e3cc SHA-1: cf7668702ec88a088cf3912a29022fdd2169cae1 SHA-256: d0c11f43a63aabf43aea47dcb9b315bb8cb044fd39a00bfd3454348c1f8206f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's file upload directory. These links are designed to host and distribute further malicious content, likely as part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eed10dfef---volegewedoxisatefokewi.pdf In PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa614b964d7---kesinenepaxivodalisuboj.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/24817382354.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087135eb0bc6---49636965354.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607da131a2d74---mebamarot.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/fajik.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b756f3b55---33314173009.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/tazajotubezuj.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/ginazodesodexiwibebixafat.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/jemarufejekage.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/44905223606.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b717762725449bb2f04cae269409c2bc/43717794820.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc4e57ca3---87384247095.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/sigagovawupubevexemapuz.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d65d35dd29---18602910148.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16089a19d27d94---16146051218.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/9lmvtkieb737smnlosn3fp9v33/jujajobigaduzov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+anger+of+stick+apkPDF 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_off0000d041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD041 10972 bytes
SHA-256: 68385a298c71817b1c442f76cefeb07899ca867834da36988c354257cbb8a322
font_01_sfnt_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 17828 bytes
SHA-256: 38af5db02807c1dddc756a510da3562e9a8fdb412dc4fb10c98fbc7692cbc7dc