Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ccf8a53f8ae2279…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 22:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b08b9242a793e9f00d8c0a6aa0a41812 SHA-1: 32d14621f9f7c846aae1153c410567a46eb7a24f SHA-256: 8ccf8a53f8ae2279e6943497e28556c337ebb2347e96e10df7881f68ae83ffb4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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
  • 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://oniceh.ru/uplcv?utm_term=favorite+apps+for+android PDF link annotation
    • https://www.meditech.cz/ckfinder/userfiles/files/16482916007.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/judulowipifuxapuv.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/81312935879.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/30e04e4b68809b43849abc7b76c94f9b/tiworinowijuxu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/3ef2bbcf2131aae0b1db8e814bfd779e/28922274514.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/38116298767.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/89580728923.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/tupufuxasi.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/47913859416.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/jefininadetezexofetu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341a4000899---manitofutave.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/69844254525.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210907091209255.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/96161738385.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/sobixi.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/jugabujem.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/miwituxu.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/33849979014.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/61324191141.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/terizukalofefodevisada.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/18908689056.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/zirefeza.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/13524077859.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/10444045990.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/nulawedojosunepezurox.pdfIn PDF document text
    • http://onelove.cz/file/buful.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/87327445668.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_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 18240 bytes
SHA-256: b0cfc87d732ae59e65a0f8fdf46599b87fe40bec51af548ebdec7aee4551b2d6
font_01_sfnt_off0001191a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191A 10488 bytes
SHA-256: c94b5e674736c7ae71ff7251bd3be7469492ce6ad01931122fcef39b009fbd98
font_02_sfnt_off00013116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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