Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4d613b8014898d…

MALICIOUS

PDF

75.9 KB Created: 2021-09-03 10:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 76a50f05df939760c3ce8673d184f199 SHA-1: 5c8bbdf56ec70fe95e397353f7c7f93afec2f8ae SHA-256: dc4d613b8014898d66a4f09d414f38c2c6370fde8cf5dad9f63b387fb156db9b
96 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple compromised WordPress sites, which in turn host other PDF files. The ML classifier strongly indicated maliciousness, and the presence of numerous links to potentially compromised CMS upload directories suggests an attempt to distribute further malicious content. The file's structure and content are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/it1u0he47c39pnuq54q6rsg4s4/56230521522.pdf In PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce3439905e---litudapudivinabugo.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/26545220388.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ffa90c22949ff10b913fd3f0aea5bf28/beteva.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/m8h24h9bfoc90tnpfetf3nacc1/jojenadiwenun.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/83636491977.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96ea1020e---93331413896.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/17165232641.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca895d5571---8063829085.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5173b7d0e4---72008616972.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/taxamos.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/88284321128.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2bbb6139a90297e451790ef514358937/71269193304.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/lidujiw.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfe079de78---gavuxisidonulu.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/babavavipowomezinodipe.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb95ae7c7da---65211976818.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54e5b1308---79239658406.pdfIn PDF document text
    • https://drlanda.hu/user/file/refarasazirejarekon.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef0f4779f---kovupat.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/83e2e0ee3cf3f7d459edae7593ade40b/makobekodukoxo.pdfIn PDF document text
    • http://parfumland.sk/upl/jaxolawepux.pdfIn PDF document text
    • http://rurisnet.org/images/file/towejifukamowuzewixojuli.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/sekurusarisosuluke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=2018+kia+sorento+owners+manual+usaPDF 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_off0000c1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A9 10952 bytes
SHA-256: aff27be45fb12d547a1a42bcec8d4d5d2f2f61631ce8fd2315de84f26dfceb28
font_01_sfnt_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 17644 bytes
SHA-256: 17042d817a01824c9baf29a6fb1406626e30ef5713708965a98d161c87d71288
font_02_sfnt_off00010991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1