Malicious PDF — malware analysis report

Static analysis result for SHA-256 14fd8fcc415ea7a7…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 12:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e471c8689188c5250a71fc6fd1004aaf SHA-1: c496a3ddcf29beacd4014d24808c1391059b0938 SHA-256: 14fd8fcc415ea7a7da0e14ce7cdb2f89e1d4360ba074eb7999eba77fc3548ea7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of external URI heuristics and the compromised CMS upload link farm strongly indicate that this PDF is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://slenderclub.cz/ckfinder/userfiles/files/10441401157.pdf In PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/c3e2e1cacb263ae0ec28e20909023ed1/72622305840.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/76753449506.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/gedugipuduviwumumum.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429223347764964.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/290536563540.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/zupejagodugufemaluxa.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/wikudipopudafoxogufe.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b49a47585975716fc95bbe843f8c36ed/datugakefeduxumepidumub.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/patezafodedijiwum.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/dadoxorotedumapolalof.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/kevasakevada.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/64705187531.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0043607a56---lanogum.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/31964187820.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ao32b794u4kbl7sn32nafjrse7/lejibiduzulifizemoma.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/37867536212.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f16297f01---62163824004.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/galupemeno.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/17639683591.pdfIn PDF document text
    • http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/makilu.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/97416124927.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/432jvdogkfue41cliuqcr8d06l/81175687198.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/fuzarububegevijabij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=stop+obsessing+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 17580 bytes
SHA-256: eef6d875479a94f633c7861897e1e71b64a411d93fc6d9da41abe1c4e8d2c4ce
font_02_sfnt_off00012511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12511 10580 bytes
SHA-256: b349ce1e54818781c9d9c211194db1e28e205ef6df72f15ce88bddc32e5835c3

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