Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a109d69aa40a2eb…

MALICIOUS

PDF

76.0 KB Created: 2021-09-11 08:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e38e9046c0a74a1f2cec2e947be8fe80 SHA-1: f500c0af4be603bbb9e71b65a2f78a8d1178db67 SHA-256: 8a109d69aa40a2eba07f1548abd4b4dc2a8a1d595c438452e51c9b934e339d0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF is used to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://drafthe.ru/uplcv?utm_term=premium+hotstar+mod+apk PDF link annotation
    • http://aeusjtu.pretty-match.com/upload/files/7336419787.pdfIn PDF document text
    • http://bushurov.ru/images/files/mipufomeve.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109071431272567.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/dijobavupe.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/58891035162.pdfIn PDF document text
    • http://kco.su/userfiles/file/33197870625.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/23449374928.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/jefenef.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/kesezilolapunuli.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/164bcdb1d57e9dffae81bf2be45d2a7e/woxolobewonijuxa.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210904_A4CC275BE0BDC8B7.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16294652682.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/78832982302.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/suxozasemulukagawor.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161381f31aa1c5---sofadal.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/84681993481.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/41638455443.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/18942056443.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/nomufowesurog.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/54875876679.pdfIn PDF document text
    • https://spacio.hk/attachment/file/jofubozasog.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/oo6abaf35oe0nlfon4csu6s9o4/87494634605.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613663fd1beec---56806375109.pdfIn PDF document text
    • https://bloc-immo.com/images/13302491803.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/sasemazovavub.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/97717768093.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_off0000c4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C3 17472 bytes
SHA-256: b28d50c80762d7c97525a6ded250a1b4b1e5fccb6beeed6e1fa44b515caf9db0
font_01_sfnt_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 10700 bytes
SHA-256: 4ce66b332621ab41c6e212b751ac20c05e29ff1ebf792479525378b353220a8b
font_02_sfnt_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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