Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6518d08a66b803e…

MALICIOUS

PDF

70.7 KB Created: 2021-09-09 13:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9e230c6c31d390a88683d03280c8e5e7 SHA-1: f136119d5a12e0c875701cdaf172ca69dec778bf SHA-256: a6518d08a66b803e16ba72df5bf970887225fb3500875e1f4387068468708b3e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, many of which point to compromised websites or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

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 https://mn-lawfirm.com/box/userfiles/file/69421276015.pdf In PDF document text
    • http://autoandtruckrepair.net/nbloom/fckuploads/file/51299114422.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/71132861437.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/m9h52454q30bmf6e6sgjh0sm47/dikezorinemikakigufanel.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/58371840507.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/wigunufakulerowiso.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/47397363660.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/penipukazexa.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/fodutebutirukeka.pdfIn PDF document text
    • http://mfahk.com/upload/files/libasarivokunug.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/93166239439.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/tujukixon.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/zujemogejitapegusun.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/30471833421.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/nikuzetavelifititutedepo.pdfIn PDF document text
    • http://tano-cable.com/d/files/39963929797.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/71440291860.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/xuxadugito.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/98713070555.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/50755890246.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/gunapunazigif.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/58008687917.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133538223cbe---feteminukuwuzinolagadul.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130834625eb0---24738771926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=shadowmatic+apk+full+versionPDF 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_off0000cb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB64 17096 bytes
SHA-256: ee6c931cb05f790d01297776b72f907d3ca44f94542f41b8d77e6f7b92904f07
font_01_sfnt_off0000f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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