Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3cdc1874a7a501…

MALICIOUS

PDF

84.7 KB Created: 2021-07-07 19:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f84cde83cd193b3a7b559e080d1b24bb SHA-1: 785ac6511eebdf808036eb8179c5903f8e1bcc8c SHA-256: fa3cdc1874a7a501cbd6da1b52fbb0730b2e08928884f2c313258919c3c82576
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of hosting malicious content on potentially compromised or disposable sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://khanikango.in/file/midetexatodobovifom.pdf
    • https://idd.no/ckfinder/userfiles/files/bezubewufupugojigemevenel.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/fuj24bfos20cr8hdos14s4nd54/85624735639.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f27563a53---44525440945.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb26d0ead2---77464622867.pdf
    • http://bangdientunhk.com/upload/files/venomuwowogopugugasegazo.pdf
    • http://topup-fight.com/ckfinder/userfiles/files/14970036014.pdf
    • http://citra.cl/userfiles/file/tivesowojuxinijipanawal.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a97819b6de---84101727732.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c54c1adab8---dajotebepajewida.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c80a2cab2---pinefilum.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04bd96444---nivimopetobawekemivovad.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fed88706bb---jifawixuwux.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/3nl8mgh4lf117hsvnegrq2ejbp/10871692410.pdf
    • http://ikoi-es.club/yamituki-n/uploads/files/sepagelamesujeveseketek.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2e608a1629e1ec5cb7654d9cec7ad25b/jemivalewubekabiruzuruk.pdf
    • http://magnachip.cn/userfiles/file/20210520193745.pdf
    • http://haithuanphat.com/uploads/files/99234556115.pdf
    • http://czapla-dachy.pl/public/images/fck/file/43965450834.pdf
    • https://avigailpekelman.com/sites/default/files/file/faxepafudojikezuforesaza.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f3a44286a---zofufilodid.pdf
    • https://seitonsolutions.com/ci/files/37590992657.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879cac388ba---74863910178.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sid+from+ice+age+animal
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 16792 bytes
font_01_sfnt_off000106c8.bin
a490af52f7cf0bb34b83b382240b4f456aff93272c5b95d72512f64e9bba6d91
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 10628 bytes
font_02_sfnt_off00011ed4.bin
4bbc7fd33cb84e974a7d7fa0a5d59592bcdfcee386cc08094bc1fdfa2d812fb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 15252 bytes