Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a8b6b55c607e71…

MALICIOUS

PDF

83.7 KB Created: 2021-07-22 13:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a49b235e5a4df7e6af4b79ed5c0f5ec7 SHA-1: d1bf7ea4051c467bdcf124f76c0d749875972290 SHA-256: c2a8b6b55c607e7118457690bbcd809e5d0360f5ea0e9854de3dd994b4c1f2a2
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. This structure suggests the document is designed to act as a link farm, likely to distribute phishing content or malware. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfdc77ebd4---12546408982.pdf In PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/18394746630.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/zavinodibugosezunemol.pdfIn PDF document text
    • http://absigorta.come/file/vigikofoze.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/e411b92a79e7cc178408a811db68dbaa/lulotolofelawogiwiseg.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9585e586e---75603198193.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/runibudiborosibirare.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8d269677b---tujamudevibazunupob.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/32214271722.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c0d83318348df6d037b8076e6fa1992c/95078089708.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b86cc53de---17121410389.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/lowikad.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb403097b40---57912380942.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/53fc0fcbebca038d1040f0b645e5a16f/81748336821.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/29829681596.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/dutemuvawetedajiko.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/qfn5usuq6j3rrag5o2iq073fu3/noxoragagovivumusijuliro.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/tarepujapoj.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/defc7355eccd1f6b8e578af34f7614ea/56064873600.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/4339347695.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078820745b84---bevebalok.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/57376980090.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/zenotuxoxorugobopix.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/29f96a7e88e682d2b1b86fc6a5af446e/pareteta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pamphlet+creator+online+freePDF 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_off0000e5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A4 10580 bytes
SHA-256: 8d076f3b3112cd0810b625eaaaff464dd55147c13ea6417df7912f99a436baf5
font_01_sfnt_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 16824 bytes
SHA-256: c89f0104aa9dbe7c1b6dc3db91093481e9b0e5289c3d9d14e15f899ebb05b1d6
font_02_sfnt_off00012954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12954 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1