Malicious PDF — malware analysis report

Static analysis result for SHA-256 65dc4e734e66b36e…

MALICIOUS

PDF

342.7 KB Created: 2021-07-08 07:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8801eb63252188ad325a5421186dbe7f SHA-1: 622d6c775e0b9e598b47a17ef83b0818f10b0af8 SHA-256: 65dc4e734e66b36eecb8635ef097c873db1fe589c53561d3a82be8d3a56a819f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories, suggesting it's used to redirect users to malicious sites. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

Heuristics 5

  • 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.
  • 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://st03.it/userfiles/files/kojugonopogoxabegavato.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2c929d43953a37f0d090b877b1fc09d1/juromokajarusevubu.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16088a31ec4846---zefewisiba.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a641309a897---tumunabegib.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f77c29206b---66218915876.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e434d4957d---32805516790.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d53273131---texuzelubadopitisabiwofo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c8934f806e719d31ba9e41dbaaa928a0/64030276291.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f9eb9aae2---kitivubivodiwotowufuneno.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/tisulobutemiriki.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/58984343487.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c19b93836ea---zagekubizekokuwozumuguze.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91570da7e2---54012678493.pdfIn PDF document text
    • https://kaisar168.com/contents//files/ledasekafavini.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/disapofufagilojesafipo.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/kovikititowasa.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/21464247465.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/dakikevamuresamodanor.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e1b55cdb---60026852720.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/nipuj.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad9bf1d90---44596172216.pdfIn PDF document text
    • http://planbmedia.hufiles/fifamewulewo.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/wukerudemifugetuvorimilu.pdfIn PDF document text
    • https://micsys.in/userfiles/file/80256970952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=in+a+process+costing+system+the+calculation+of+equivalent+units+is+used+for+calculatingPDF 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_off0004e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E187 11444 bytes
SHA-256: eaa1882bec4a3c58987225a2b8462fa8e1b23b5ecf0390c72657475db391a509
font_01_sfnt_off0004fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FBDC 20904 bytes
SHA-256: 8fae540df8da40874846b89afaa5ab6ba78b1b2d87f916db02475b855a55c528
font_02_sfnt_off0005328b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5328B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1