Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef91978debf469d…

MALICIOUS

PDF

73.4 KB Created: 2021-10-05 12:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92d368d6e1deb2e93c299d1b966b357e SHA-1: 2e1da5646bf6d8c24a219af3d49ee15bca7de9ce SHA-256: 1ef91978debf469d5e2d4d8db3a504f3c9e066a399d279c4df40729d0b089d17
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable binary data, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5901

Heuristics 5

  • 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
  • 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://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/12499308619.pdf In PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161572d46019d2---bojiwozinuvuzepas.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210922234723_1366102844.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/59814791673.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da46b465dc---vemilubajifumeralikigo.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/zivirare.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/ninupajupit.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/89514298152.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614203e637569---wiruwuxizanasugod.pdfIn PDF document text
    • http://knipia.com/userfiles/file/37836421339.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161327c6fa36c8---vezowurorunokubanuzusarul.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/46381507035.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruvituzaparejufag.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/jifixurujoxafanebonoba.pdfIn PDF document text
    • https://nevisnews.com/userfiles/14776414210.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/zulabofivonum.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/9189581260.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/jofekexoxinogomuropa.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/84008635081.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/9012057611.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/fajezodovegol.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/80813799336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=abcd+is+a+square+of+side+10cmPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 20244 bytes
SHA-256: f25e13ef1a89df7909eb879a15091984e25c581cd16d8a8710e98142c39e395a

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