Malicious PDF — malware analysis report

Static analysis result for SHA-256 e210c64d4c130bac…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 03:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6146f7b1914ffc0858e2e8147d40ea8 SHA-1: cad82dfb77a3b94bbb342e7d0cc907efacb973b7 SHA-256: e210c64d4c130bac8ac6c3648e37de9baf3a99bad0bbf91f0a7a0171a717cec0
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on potentially compromised or disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be part of a multi-stage attack where a password is provided to decrypt a subsequent payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://hzjksj.com/images/upload/File/xuvotu.pdf In PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/340dfec6541d65f951e9defc3fdf3313/zasipijumifalufunumut.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/44235420738.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/wexinuno.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/96977934160.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/lakararivesodu.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/89612432070.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/detajigupufiwejar.pdfIn PDF document text
    • http://strap.sk/uploads/file/togubipunoxexekofalemewe.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160725efa2031f---93671861601.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2o433n6i8nl7upvbr5tgs83912/napupagowofobikaginedipe.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/1ketpss57hck6ro0600c85krbd/midalapavinigewuwi.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/golefovewojaxajad.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/2464eece1e1f2036c7187acfc1b4459a/vobusipitef.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/kodusidagemorujiremazu.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/rusepopapapuvojitu.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f180c7e58d---nonarezinilobamukoj.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210502033720112.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/55fd2c1fbedaa4f86e732e2a327f1e1e/21703535221.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/95347629369.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/vulesazimo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/46659586429.pdfIn PDF document text
    • http://hodori247.com/uploads/files/jebugokugukigupudufewusi.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d470d3d5c8c---welatojurukimat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=organiser+les+pages+d%27un+pdf+en+lignePDF 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_off0000d0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BF 19072 bytes
SHA-256: 6aa76f7459307ca8de872371050c9228883673738221fd789267833348e3f829
font_01_sfnt_off0001011f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11936 10616 bytes
SHA-256: e3b8649111bea9feaae12838036667ea17fd40bbc67fbd4eb62dede51d2d406f

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