Malicious PDF — malware analysis report

Static analysis result for SHA-256 04339232707da021…

MALICIOUS

PDF

70.8 KB Created: 2021-09-16 11:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1348ebed6a2e0462e41b852eba637faa SHA-1: 5a98d3282e73641ed16b96888261ced75c754684 SHA-256: 04339232707da02141e6fa7975f8d9ff05786e8da28ed8467a0ace1675d92262
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms. Heuristics indicate this PDF is a link farm on disposable hosting, with some links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://floraplant.gr/FCKeditor/userimages/file/49683299958.pdf In PDF document text
    • https://harteron.ee/userfiles/file/manafutigonoxorolebinenu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd43dfe41---44198653629.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/79780740717.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/fipijuneruno.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/mezeruxakufevujotasizu.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/xazalibiluretigoliv.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3bfd8bfba5ab43e6849635ff4b776f7e/2038569916.pdfIn PDF document text
    • http://onelove.cz/file/lifumogukifi.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/29434740868.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/52832467845.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613494f35023b---60832120026.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/gn1mo0t81jk2tqg2s2uj6u9gf3/juganenefuzojide.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/tomuremad.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161305759525af---6764915551.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/58291229863.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210912214746106.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142434300dd5---womewulelojebageri.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/77618415678.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141b8020921e---daperijiripekikujufosi.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/84854400646.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/logiwagev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+update+11PDF 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_off0000b5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0E 16044 bytes
SHA-256: a3450936207ab0c3a185019a1335348057661c29af2c85a1b51f862f837c7b72
font_02_sfnt_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 10304 bytes
SHA-256: 738a66b1766dfdc96afdaee4a3a901287c9f87ed726a2ecd688bc4ce66071ed5

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