Malicious PDF — malware analysis report

Static analysis result for SHA-256 650805080e7929ee…

MALICIOUS

PDF

70.8 KB Created: 2021-09-09 05:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b5394c761b4c5abc06dba3862566f83 SHA-1: cc8be2e2bc25557207dbc5993604f9567af14211 SHA-256: 650805080e7929eec084d8d49a8d19ec08c283712108110f1f994cb7d9ca95c7
162 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or initiating malicious actions. It also features a link farm pointing to various domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5683

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.
  • 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 http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/jimazijuxemilerelo.pdf In PDF document text
    • http://dydlhx.com/upfiles/file///xadovezazadurapuzozer.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130c1e57bf77---7313705869.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210906031628.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/41805019608.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/34340820265.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/zanumezoxiginef.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/sesiti.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/luzutukef.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210905220048_160813668.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/rizizimujalenesovofefiki.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/43279958061374b32aa2b8.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210908021025.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/zumuvunugonezekoritileb.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/sazupifupawowotozaxaj.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161353a646213d---1816669492.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/lukasuk.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/90212217016.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/67934038942.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/85p7t4420h7itdf98j0jrmqgtg/sajadajadolizokowijal.pdfIn PDF document text
    • https://kaparatt.com/images/File/wifalajaxu.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109082025099007.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/meweminapufijexuwuwam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fall+guys+online+game+freePDF 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_off0000b939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB939 17236 bytes
SHA-256: 59abb17a9250b9fed9182f159b475c242ea3a74483212c9c30dccddfe71f9553
font_01_sfnt_off0000e61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 10652 bytes
SHA-256: af231e8ccc3dbc2b75548b9659bd95c66d2e7ffcc3e5fe44efebeb79ee45b421
font_02_sfnt_off0000fe7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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