Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a8cde9b26609bb…

MALICIOUS

PDF

75.9 KB Created: 2021-09-03 21:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e9a35f5959b883bb16601ad464e65813 SHA-1: e9dc25fe1047e1d8b932612ae13c4351b4e2c915 SHA-256: 35a8cde9b26609bbb7c0d9a252908a7688725e0c494c8ff82abe71e1f1870a37
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely serving as a lure for phishing attacks or further malware delivery. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces its role in a malicious distribution chain.

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://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613002aa71d81---zuxijawibixunobo.pdf In PDF document text
    • http://lose-weight.tw/upload/files/dewunareguwobelos.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501085851910785.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/96880750481.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/508e6b88116e532e29c1090cdd4fc541/rugalezeli.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/312dbaf1719a807845150a5f675435df/90402797459.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f0bb77c2d72---mugugojirugidupo.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8725e0088---70742035502.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/24472123031.pdfIn PDF document text
    • http://atek-ent.com/upload/file/83424836455.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f3421a3d7---61374013975.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///60947001908.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc399b338f---gadozowuj.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/59844277939.pdfIn PDF document text
    • http://kotolantopeni.cz/file/75210273892.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cc0e90bb35---ponaxaxiwokovadan.pdfIn PDF document text
    • https://datajournonepal.org/files/zefemisabotulobakuvupuret.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/vemed.pdfIn PDF document text
    • http://japhina.com/upload/file/vivijov.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sexodep.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/55102609188.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/refatisudikejozed.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a82b1f0295e---bagute.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/darimejefeweduvesa.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b5ad00b09---notekad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=atlas+de+periodontia+pdfPDF 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_off0000c569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC569 10472 bytes
SHA-256: 76545449d9e7446ca07b06eeb0b52fe8505e49e76bb1262c67885636a1e97e15
font_01_sfnt_off0000dd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 17264 bytes
SHA-256: 37a8510d6d475d22c74fcd9cb77a3ec234ac2eed750b9de52c96361d87710c0b
font_02_sfnt_off00010983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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