Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98c96fb478a03d3…

MALICIOUS

PDF

93.8 KB Created: 2021-07-17 18:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d674eb7127265027bbce33e10011faf6 SHA-1: cec6ee43f6e425d843391d611f5c02b6c042f097 SHA-256: d98c96fb478a03d33568f587e40cecbaf8af1a69f7a1664aecd48c98cae50400
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 external websites. Several heuristics indicate that these links are part of a link farm, with some hosted on compromised CMS platforms, suggesting an attempt to lure users to malicious or compromised sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://inter-travel.hu/_user/file/55119536791.pdf In PDF document text
    • http://internationalnetworksolutions.net/files/377633896.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2faa7791e---naliroliz.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/14304526324.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/retovemugebunejuwawubowid.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/19946943807.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab9294b40d---zabetovogekokabuwe.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b09373654eb7db96874ecb36aba3f7c2/sebabef.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/tevabudab.pdfIn PDF document text
    • http://stasta.com/userfiles/file/wafodakon.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/pobevevajojizeni.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a3ed259d---zutiburib.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/9271867736.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/j4dpcnejshddhtegj9uocmm6v0/zexilumuj.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/burepigidusidakuseviz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092868156163---69831483254.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ee0892151da7e1a926ec50e7bdee167b/lorexapesakeb.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/nejab.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/uvtm6eoeb2v2b537e30ck24hq5/21817923340.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608734e847255---14905331962.pdfIn PDF document text
    • https://bonacorsi.it/file/vafituf.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/diwuniwajovipajixovunoma.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/43orkdlan7jbhjl3ed66rhjt54/misunixedofukukutenolizu.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/nelabegerapubozunixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=rice+paper+wraps+dipping+saucePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebc5d6f334---69183757773.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 18404 bytes
SHA-256: 54bec640f62e946f9f818860d00a34549c337f91185e9eb108bcb1e4368050e2
font_02_sfnt_off00013be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE1 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00015127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15127 10656 bytes
SHA-256: 99eba7f15608ce71108c4e9784344f00352d3704f4f6936efc3016a850b598a3

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