Malicious PDF — malware analysis report

Static analysis result for SHA-256 5973697fff486eff…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 20:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 389ca0203215e8a515f16a1ff3b993d8 SHA-1: ee5fdc0cb6c1f7fa72f7eea5b2da39bedd24bb3d SHA-256: 5973697fff486eff13627117e8c58857f0756b213f5e08a1802112d83797b622
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://taikenplan.jp/ckfinder/userfiles/files/nuvoteb.pdf In PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/99547476300.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/gigurirawaxubaserixinuvit.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcdaf52a35---forajizajoni.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161417f66d55cd---15520875368.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/41819026099.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/sovokamomuloguremoxuwiw.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/63804508600.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/0da01b2384eecfdc1bf1e681274844ca/vuladipulaxiza.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/ragobajexusezubupidufe.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109081522374497.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/39053314016.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/xajalitewidazup.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/jowabimetivivisapifenisem.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/16135198222.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/tinimi.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/vosawozaniboxepozufukowo.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/kigegezimagefubofukaxef.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/rumogarujunemetazifekat.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/xabozijopetulapuwijasol.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/15956466052.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161428b3568b81---37872502107.pdfIn PDF document text
    • http://storemisr.com/uploads/files/54412169420.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/rebolifenalirejisajata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=need+for+speed+rivals+download+androidPDF 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_off0000cb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5C 17696 bytes
SHA-256: 2ae895d91c64fcb9cf9e6ee3a7f6c015ec0e5b6157a24a14d7dce579e78924c0
font_01_sfnt_off0000f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 10524 bytes
SHA-256: 6fba9811ff64f7c9a1d52b532d75c8266b1f841a0274f9d2601541acfe0e4a6b
font_02_sfnt_off000111d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.