Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cafe2f9c4c1cb9…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 06:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46e20d1f61a2f0d05fcc8ffa212588e5 SHA-1: 8802923f1b112e9553ee3998abf71a2439b76575 SHA-256: 65cafe2f9c4c1cb9f0d792182ca6ab3db25aa79e81761a98f2c09700c213c92f
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest an attempt to manipulate search engine results or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://nomylo.ru/uplcv?utm_term=melhor+simulador+de+caminhao+para+android PDF link annotation
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161322cf57adf4---rixozusesokajarapalira.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/14071483962.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/rimisi.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/56856829200.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/25104885027.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/19059130730.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/35315543538.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/fajot.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210912152556.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/mudogagivuzuz.pdfIn PDF document text
    • http://showpelec.com/data/file/20210904_032811_988.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9faa79280---35063374701.pdfIn PDF document text
    • http://epicridesnepal.com/files/dojozikanuvugog.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140114d107b9---33538688668.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/viberetazulal.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/28800326332.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/20045765901.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/72228732888.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109030657226630.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/48653548459.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/madodepitojumos.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/51460504633.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369ad3cc869---livujadugodezarawatevud.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/bebamabejelawuwawi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 19072 bytes
SHA-256: 575875c4c6c270dc2c68420e4e6c442e7e6b1b21c058de68c06f06f829b5c1a1
font_02_sfnt_off0001248d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248D 10772 bytes
SHA-256: fbed959c96eb1f884a837511e06a47b2edcec6949265652baecb21bf2c2b4fc4