Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c03945233d77274…

MALICIOUS

PDF

71.4 KB Created: 2021-09-16 06:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6aa55f66acd61f3873fb39537969c85 SHA-1: 4b661fee9c787c698fecceb545fc68a9e63e43ea SHA-256: 2c03945233d77274feacc844b8884dcd1e055d4d195e853c44583c80437dd190
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with a high ML classifier score and ClamAV detection, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, forming a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or redirection scheme. No scripts were extracted, but the overall structure points to a malicious document designed to lure users through external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://corising.info/sa_upload/userfiles/file/20210914184738.pdf In PDF document text
    • http://jinwoosmc.com/userfiles/file/menexowudolule.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15d84bd60---paxejulav.pdfIn PDF document text
    • https://clove7.com/userfiles/file/fifirelelurenilajegasute.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/gutoguwafisiwudimara.pdfIn PDF document text
    • http://104408017.linker.tw/files/83420886518.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/66173558242.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210904_B836A657D3AE3CDA.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/69362982945.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/vpo8vqmrrapndaq8a3eblofaco/48901066297.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/nagefosijulixetudodagumus.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/98353715346.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/44226851326.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/3302692003.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/vekudojotudelipozipuluji.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/80995403461.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/sexatisupafate.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d36fa3f9c4---36111170010.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-5/20210905000152253608.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/notaganudi.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/75174449787.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/7914780450.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/9106066219.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1ba828af0914b13d4719153b9210ff96/34092137540.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/kinivosolewagekewanig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=power+book+2+putlockersPDF 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_off0000b8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C4 10548 bytes
SHA-256: 78c8fc26facac13d96c76dae9a614fb99ee88cdce687706e1cb1f0e9aadbacde
font_02_sfnt_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 15572 bytes
SHA-256: ae1726300d7637ffb21c49df9af10b8e25dc6078c1803ffb0d2015aa88139e82