Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b732e8f1711dff…

MALICIOUS

PDF

89.9 KB Created: 2021-08-21 07:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45678e782f1fe2138c2cc13916098724 SHA-1: c337744275e4746b29a7dc2b8641a627b3826818 SHA-256: a1b732e8f1711dffb89e385d4691366b37b9f96f294cfaecfce4626de555270c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple websites, with several links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to external sites via malicious links embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9ff7782c9bbb818fd8efe685de1df1a1/84862086645.pdf In PDF document text
    • http://medicapoland.pl/uploaded/file/rokivukomoxijilepovawat.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/wamamawesakag.pdfIn PDF document text
    • http://zzquansu.cn/d/files/84526860538.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021082104000961.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a44144a35ad---pudir.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/60179470092.pdfIn PDF document text
    • http://waterreducer.cn/d/files/32993456483.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/56441474158.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c218d209e3e---48313298867.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/46014512268.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/18171501834.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/xirep.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/31861466123.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/af8a6e1afda1fee7a10200a994721701/19651730114.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/tugomedejaweveg.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/pamema.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/89154216c5cc96c5ba0ee8ffc3b6f4c7/34465941449.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/21805841478.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/gutarekikug.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/55769173639.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/jimojazojevemunedenunesex.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b7c9d0a82---69160299257.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/1d1d05977cab90f3b43fcfc907aa52e1/datasesiwurarebitiz.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/noputone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kovboy+filmi+izle+t%C3%BCrk%C3%A7e+youtubePDF 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_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 23136 bytes
SHA-256: 9a39d4fe6a698a7cf14f1b6963e36d516dc0005b9a64b66a34c71e6e63322de0
font_01_sfnt_off00012483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 10892 bytes
SHA-256: 6d7ca49effb74848854f8ba15b73470ccf5f4e24fc6d91d7799c9f3e9be89a3f
font_02_sfnt_off00013d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1