Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3bb3143b855e29…

MALICIOUS

PDF

74.0 KB Created: 2021-09-08 09:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edc336b8825ba38b27c0c2b595199e71 SHA-1: 6863f617001868788f1aafc65e343d88937832e4 SHA-256: cc3bb3143b855e293330c47042b8afb43fc2b27ff08bdb6c78a94c7fc87d9ef3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://artecgroupservices.com/imagenes/file/zuwediwazenetopez.pdf In PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f7689591b---31260680788.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/1bb4105a55cc488d925e649d36b51587/nukorokirabusot.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/nenijukuvesodifubogozifa.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/74586449283.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/9a81bd6080832443aa550bef9ca30a65/lidovusupedasarodem.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/38033074043.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5543be508---42495550734.pdfIn PDF document text
    • http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/jitigifuji.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/27137274026.pdfIn PDF document text
    • http://simonide.org/userfiles/file/sizukosutonof.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/20454190498.pdfIn PDF document text
    • https://makenie.com/upload/files/ledulo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8780bmhv37ir5p832q2eg2qgb3/wikodojuk.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/66334428139.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/86jak32sbcpdei261h2i5n1fln/23983251786.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/86693238597.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/5ceaa1411ce498b1ee49f711c225e7e9/17487634423.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/zeloxuvajegaz.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/03c232e21b8f722d9bab64f708fa0784/kenemofuxivuvopifunuv.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/fimumixu.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/xelomiromuwofubite.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e54e12f03a5---muxugunevisigezunipefeni.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/monovokinukoleje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pasos+para+armar+el+cubo+rubik+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_off0000bccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCD 17388 bytes
SHA-256: a479f10686a5735ab1ec451a65097a2ee9c349dcaf82f70319c1283c22009615
font_01_sfnt_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 10912 bytes
SHA-256: a14cf0a38b2d78de3345b0b5efb257f29d1e2011809c8147b6d18b79637fcea1
font_02_sfnt_off00010252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1