Malicious PDF — malware analysis report

Static analysis result for SHA-256 845a654023eadd7a…

MALICIOUS

PDF

99.5 KB Created: 2021-07-01 13:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c567505476d69c6685549eb3cb273d6b SHA-1: 085c0638d259a322c510adba74cfe87b2ba3eec0 SHA-256: 845a654023eadd7a1f29749757a5d723e0ee684ce375739cadbd5a5b696d9350
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for redirection. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to external sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/10114539629.pdf In PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/2df94cf9e51ae79f8adb9c24ddd3a923/mupitiruragamefuruz.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cb68df705---moxololimut.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/pedmbkji8n56fjr916bg4rh924/ninifozabozoguwiroka.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/febowazoromonorutibuf.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/b4ufrc7nuaceaskf8obgltmd40/xofabubanit.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/94368178425.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b08c40134f8---31116573924.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a753b501d---wifeniwipetevevude.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/08b25172328dbfde9547ff850ab03c0f/75200199453.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16095bd9e3fca8---kusevawir.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/52023561816.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/jodolidokajoju.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/27923176539.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/zexatesepine.pdfIn PDF document text
    • https://area5srl.it/file/wuxelikakupixow.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160afb68984c5d---90406617002.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902c3d0f6c3---65139024666.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/78e7a1908941eda38cdbcfafd6012f1c/karinodiwesegafalolof.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/ropunudapajepenaporamunu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3bf46e3b8---10349840922.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/juruna.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c858aa8f781---22651297641.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e3f49d788f50ae7ed796948b40f73723/lunizatuxafogizejuzefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+kissing+booth+2+book+pdf+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_off000120a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 18044 bytes
SHA-256: b0fb0ed2a21256a31e4976ba93a6841dee8060bbc0fe5ef099b2ce5f40f009ed
font_01_sfnt_off00014fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000167f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167F1 10884 bytes
SHA-256: 3edcba056793ad8b8c5b257624cd735441caab8a7993be47bb214223a78733d4