Malicious PDF — malware analysis report

Static analysis result for SHA-256 c392b8530d541f21…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 17:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 307cad5729e9080d72f11dfcd67352d5 SHA-1: 737471412e6b70b965cf0ce0e13e6b85d6161a0b SHA-256: c392b8530d541f21a456a336c138a1b1c44738ad156e1c1928f1cb8a94859b34
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or lead users to a phishing site. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mgocsm.in/userfiles/file/dovidipajo.pdf In PDF document text
    • http://anandamsanyal.com/userfiles/file/xowopup.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610046bb6d32f---45294121179.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/dulefaze.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16121973e5b76c---18857305648.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/24269674630.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/wenesizavebukex.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/nilujokavemalefage.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/87526698611.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ad00433a85---4340796599.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/50282916454.pdfIn PDF document text
    • http://szhlfz.net/upload/kapokojakiwu.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/bafiwura.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161103bb4504dc---roduxazifapuxozipo.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ec3b4055---saxug.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210518121656.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16079e5959bb6f---nejar.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210726_02CEAEC57B6C8587.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d1896dbd338---66012960639.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/99414440834.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8057cc707fba35e847d5b3fe6f479845/nugiz.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/8087908154.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/bimef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=if+you+love+it+it+will+grow+pdfPDF 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_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 10556 bytes
SHA-256: 4d38b9df0f7811e0099666f30220e16724e3914d39b1c022c43d01b32ef2a2e6
font_02_sfnt_off00011788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11788 17684 bytes
SHA-256: 227241e399d654bf04da7a46be423a82d291691d86996d52cc078aa4d8c826c1

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