Malicious PDF — malware analysis report

Static analysis result for SHA-256 23390946e9a1347d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 04:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f310ffb0fa5ff20e6c7d842b8278f0ea SHA-1: 9f24eb3a024c0abfdf8ce002496d5075f6a60597 SHA-256: 23390946e9a1347d2c8f9ebee6bba979f2c988009b427660160584edef82a69f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload directories. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or scam pretext, and the ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=tangy+curry+pasta+salad PDF link annotation
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/3fb2cb849ddf0cfd0b70fa0097dbaa12/baduxonodilobixufopakozaz.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/87577697128.pdfIn PDF document text
    • https://norservis.cz/files/files/94249676823.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136ae287b5cd---18299008918.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/kukatog.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/xegaritawipexupureder.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/pevewabebaferafojunuxexu.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/dukofaja.pdfIn PDF document text
    • http://kunbot.com/upload/files/69405418107.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/68392845066.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/76784623488.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/xeseg.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/kugitepixab.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/vopuposoxibowasode.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/2740049429.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210904034654529620.pdfIn PDF document text
    • http://state-lithium.com/upload/files/kibimuvotogil.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612f142f528f6---mulune.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1e8e04869cc67cd153206b36826039f3/pulatemolilod.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d236b566b5---zonojolunile.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/15865538814.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438eba93028---vivosowunijopimurabe.pdfIn PDF document text
    • http://rayer.cn/d/files/19670442165.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/vikejo.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_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 19468 bytes
SHA-256: bb6c7e96c6c318c4775e4161b22500c308467609e4862b21b8e5c5bf5f0e483f
font_01_sfnt_off000108e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 10520 bytes
SHA-256: e4a973593daceba3e26d8a5a5fb26c1cfd5bdef4eeebd725dc6760420eb90e04
font_02_sfnt_off000120d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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