Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde90c36d4da8114…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 15:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb14ed5412542112c0340ab323412c3f SHA-1: e960e48dcc922a10aba505153d7a60108e7987d1 SHA-256: fde90c36d4da811421a657786b91c309836d96789e7d2454e6533c9a4e874889
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://canadanur.com/resimler/files/lexixana.pdf In PDF document text
    • http://ronaldtan.nl/images/photo/gexod.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354ef5edced---balaxanimofipigixinadovos.pdfIn PDF document text
    • http://globalcentral.net/contentupload/fckeditorUploads/organization_/file/38065086598.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/19548234250.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/tujukixon.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/57713636273.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/jekadoluvelulix.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/43208603162.pdfIn PDF document text
    • https://asi-filter.pl/files/file/jipavevurogixurafufol.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/nijabozufevovujapepivumi.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b402fb5779---nikajuzotivosexa.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/zexizezalegutizopoza.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/87e0fb93d110e77526d6595071720639/foferifufiwidaxu.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091215461062.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/gazukakexixikavetusoj.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/51718353904.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/wogovemususate.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139411d3fb01---sobibudas.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/99682271694.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/43714869476.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/55722047181.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/pojupafik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=c+compiler+apkPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210918/16319414325875.pdfIn PDF document text
    • 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_off0000cf58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF58 10288 bytes
SHA-256: 6d84a14317df7a01daa44eed51169acaf1742bedfc7fca662d90f1ee6ab3ba98
font_01_sfnt_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 18952 bytes
SHA-256: 7bf4db118c5bb710067f43fa3a90fa071e879e00874ae358f7cc07ffaf9d3876
font_02_sfnt_off0001189e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1