Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6052a94a758223…

MALICIOUS

PDF

88.7 KB Created: 2021-09-01 08:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6a1ca24f10f3a81908a4e2740e28cc2 SHA-1: d376a4b0b61d27be08f670c2e2f18575f97bd206 SHA-256: 3c6052a94a758223ae62467a5ce0cd7beca15e3afe73db98d6659fbbe8607e2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on compromised CMS upload directories, suggesting a phishing or credential harvesting campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://archism.ru/uplcv?utm_term=i+am+malala+pdf+young+readers+edition PDF link annotation
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/tafafakifegodo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087af2c839aa---bijanuruwagonugure.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b281c08aa---72841079207.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a15ef18ca---64298652875.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/7a69b05a3c309529218c640d54b7d6da/76321372121.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/zidanomiwuwikuterav.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/k9pjd100nalcb7h6tabmvhmkjv/71526444017.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/rekadowizo.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/jemowunebizafumepogov.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070195951c20---18437425786.pdfIn PDF document text
    • https://menu2uplus.com/images/file/4962872129.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/katutofutap.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1e9931658---jawoni.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/73420511538.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/jaxejowibajagidatel.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/71106521959.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/qrq3pnuh6rfhs1mm1sn9jk2b49/wavuzedugisowivajo.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a52c61834---58195135459.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/72322770649.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607386127d3be---bosugegejekaxaxen.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/74455335336fe717a5d075691a071d23/bejepujoxemurawijopomubi.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608eab04b1ce4---18975416340.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/69764053006.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/83686840765.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/184f41c95a51a8102583e23430c5c8c7/bujipadisulera.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_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 18308 bytes
SHA-256: 3c2241513f69d9ede32ed151f9667f237cfe42ad1d49941615dd99ebf18b8c27
font_01_sfnt_off000122a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 11004 bytes
SHA-256: 963bde80c79bbe72cb7ac3deb18eaea480ce7d082b42dcdee877a3eec6f06a6c
font_02_sfnt_off00013bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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