Malicious PDF — malware analysis report

Static analysis result for SHA-256 61805bfedc7abec8…

MALICIOUS

PDF

84.6 KB Created: 2021-09-10 14:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e64b3a769e5b4e5c946f518a32cd441d SHA-1: 3db7b70b0c6c0c8ee09cefeb401bc391e6070dd3 SHA-256: 61805bfedc7abec8ff3c3d159cd290176fe136c42ce62935e3c315d5d07e3647
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4115

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dialogueinpraxis.net/files/docs/zowiwubarunane.pdf In PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/buvoxa.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/xedasamusijajuzomujaxof.pdfIn PDF document text
    • http://belniig.by/public/file/89059981226.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210902015753993.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/71694366242.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/danaminenolisimalelo.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161355673744b9---xiduxadolisob.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/ruzogidonobitofifokevo.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/25440735235.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/090708012064.pdfIn PDF document text
    • http://web5gstore.com/Files/files/midufopagabel.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/xisuj.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/66893042383.pdfIn PDF document text
    • https://huanghecables.com/d/files/vonowaborupodupoxe.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/60384905376.pdfIn PDF document text
    • http://methese.com/upload/files/84655152952.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/17408937103.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/5e95fd7b0b7eb481fee43f225925e072/xiwajujiwudekaweruz.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/35288559709.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/6376253440.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43df0757d---75975755240.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/59003696670.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/79905377799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=top+10+action+games+for+android+offlinePDF link annotation
    • 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_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E4 16904 bytes
SHA-256: 879466ae0208950438889302265fad7f702f578d00e09f1b93f9c40951f8a2da
font_02_sfnt_off00013cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCA 11100 bytes
SHA-256: c92df5ab6fbbcce61508ffc57f352492eb58a8850ab55573cc886492f0e221b2

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