Malicious PDF — malware analysis report

Static analysis result for SHA-256 332a53ee044e35f1…

MALICIOUS

PDF

86.9 KB Created: 2021-07-03 13:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 83c1f35f6ef6a9ec24b1eb63bc6bf4e1 SHA-1: f07c3b8fcb816329c6532874ec6b32ca7f13ee4c SHA-256: 332a53ee044e35f18abfb0c07b9926521909ae1188e77bf3bdf6a2bf30b09eeb
156 Risk Score

Malware Insights

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

This PDF file 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 upload storage and other disposable hosting sites. These links likely lead to further malicious content or exploits, aiming to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/522c060053be463169fd02b435530cff/58998576157.pdf In PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160781518a71c9---momakefikeselix.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/43931663564.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/81703740975.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0c75503e1---26443059095.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/73859607540.pdfIn PDF document text
    • http://blueyee.com/upload/file/281420183104.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/71166806225.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099df25ebcad---tirabulog.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160837393e6c16---47301800331.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9fcb3242---45546618139.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60f440bcd3---daduvaxekikifunego.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/98b086f4eacacbe98e6845c99b6f4954/28701109053.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/sowikapomupoj.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/lhdh0ntveqa9mrfkseo3amfpb2/56645592942.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/nazikifevugiwadeputegup.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/59182061686.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/72932257412.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a610379c18e---4335035958.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/72b6ee30abb6361cc716b9f8b9fd249c/sazogumijap.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/49082893423.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/iv2lmo473gbf8mfal1pb30hp0p/rinasazelesetoloravoxilif.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/34996166283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=in+the+outsidersPDF 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_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 17316 bytes
SHA-256: 676726730d375778c2189ec9f9cf2677e90321a0932e391604a9ba6f86f135fe
font_01_sfnt_off00011fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB0 10188 bytes
SHA-256: 32d8529c68cfd7d3b435915c0d1c47a5aaf9fea550d9c8ad55d3bb3940f3d819
font_02_sfnt_off00013672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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