Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce399f7567c4c0cf…

MALICIOUS

PDF

79.1 KB Created: 2021-08-27 03:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e075db35b209819941becca7cbf92244 SHA-1: 5a59601a325117ad3fac9a3a5a4843f100ac0acf SHA-256: ce399f7567c4c0cf3fdb8ae622d05e6b4ddefdfc74167638a63abf8af4674f92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://aczv.fr/userfiles/file/96191924434.pdf In PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e6d09372b85d3219ec9a60ccded0086b/72835699667.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6fb0c7a9f7160d1a8bfe9d15cc6f7198/83933864373.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/52469920145.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee18eadae6---jatifirovinew.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/terokegesovebepexi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6e3ec0ff2---61437096204.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/19537192264.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607d02437019d---nerokupijojatuk.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/kavigasojonugepuwu.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/dirufefodorujomifugori.pdfIn PDF document text
    • http://woykoff.hu/upload/file/majasunalenerobumenuguze.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/mudekilikukagikexarebeni.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610a104a9b460---poxosexajirogarizofizatu.pdfIn PDF document text
    • http://leton.pl/userfiles/file/fajewolotuginatofik.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160865c59f1377---16775500316.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/64257923576.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b25b7459e---ronejuzowozinasoti.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/43203188566.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/20208985237.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/dutamerinor.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/peq6tvdkjg7tm4r1lonvf44bfk/sinifuponovazenoju.pdfIn PDF document text
    • http://calisnt.com/uploads/files/78471397471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=corner+stretch+for+neck+painPDF 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_off0000d6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 10656 bytes
SHA-256: 39e873d2c65540c258d37c0ed8eca4d860d8dc792049eb8fd4e4946694ef55b9
font_02_sfnt_off0001073b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 15448 bytes
SHA-256: 887b71f9d0b2670d38751d9bf2b449f7fe61cee8dc57e0ff73f32a757f46384e