Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8f3201a4f9448f…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 12:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e5e3cebba1db96eacc9db1c8c079411 SHA-1: 5848f74f7a0e84f86e9f877c73ee319acf7b6850 SHA-256: 8d8f3201a4f9448fcc8455c4e445d4f550f823b1002f3d080b59cc5abfe764fd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute phishing content or malware. The presence of external URIs and link farms indicates a likely spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7431

Heuristics 5

  • 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.
  • 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://rurisnet.org/images/file/21367921486.pdf In PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/687a8e990b90026ea84dd0a8582bc63b/guzejoxuvajad.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/parezil.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/53812571440.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/rizananidarexeg.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e829d464f7bd51fa621a96a7860ba871/53224088815.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/18663f08b8096085814d5848208a9653/89997635325.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/88270229589.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/39960635903.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210729220932739479ugm01y2nbo2v.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/27565869867.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/25041334195.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/fufizuxobi.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/setovetoku.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086d8cb971eb---xifarabajawij.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e89b6a057c4aebcd81f98e15eee7c534/sekuvedofelemusununa.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a0c30e28e---xegizefebekexijomusuf.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/39060923194.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/gifoxopemijalowupid.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1e66230e4e70cf17008372a4df142a12/29731144619.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/97218180976.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/eb010f740dc727f02cdf40c65139df89/87315895259.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/56243534616.pdfIn PDF document text
    • http://camonetinternational.com/files/file/56525652004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ibps+clerk+pre+exam+pdfPDF 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_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 10652 bytes
SHA-256: c5965c669ac123f1a715f1ce03c49bccee1121202457c77a1977e63dc258085b

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