Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55c8caf09062841…

MALICIOUS

PDF

88.4 KB Created: 2021-09-17 03:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50bd40549e16066f7d8108e99d2ae961 SHA-1: e2708e76ed5fcb9f500f26eae349ef8a1924e1e2 SHA-256: f55c8caf090628415b5d86e418f3fbd8a3c157140c582f330f6944db84889dfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of 'utm_term_redirector=True' further suggests a phishing or traffic-driving intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.
  • 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://www.agencesramos.com/ckfinder/userfiles/files/22669193532.pdf In PDF document text
    • https://senfina.top/uploads/files/rileduledoro.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/wisividejapo.pdfIn PDF document text
    • http://355353.ru/userfiles/file/xabenigozawodojuvag.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/15819536067.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134278bc6ea1---mixobolejuwukib.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/16098997794.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/26014614697.pdfIn PDF document text
    • http://shopabrang.com/images/files/weputesatodevot.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/zefoletojuk.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/gozoxunumir.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/86440743069.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/8038b02a7cab9afa4b3ab945f55f6255/46904834339.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/61548276332.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/2190597725.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/59526053461435273bcddc.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/xisovakudojefojupina.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/tuniwabumij.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/18710063248.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/sazoriroxab.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/vegew.pdfIn PDF document text
    • http://deauville.ru/files/file/86532850192.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/db4d592a782a337d25e170e157999a12/28007030677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gta+1.08+apkPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 23248 bytes
SHA-256: 2c6c945df8fea5b4143744201393ab76fc9db0bd736cedf4317868c5b380772d
font_02_sfnt_off00011c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 10060 bytes
SHA-256: c106b8aff9f186569e2679d9b3b355cd9e4f21ae9ebad3b4d89bf6146b7fe41e
font_03_sfnt_off0001332b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332B 2076 bytes
SHA-256: 1f799b7ff30558cb797733d0d863c6226dc4eb0c112cd2fbd9ecd7b64b66777f
font_04_sfnt_off00013c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C94 16384 bytes
SHA-256: b5cba810ccacd47bd6dfe858c2b1274c49fc2e3fc3ae529cbb14c80a65ff9de5