Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeda5490431b8382…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 05:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ce358f1afcc19c5ea843fa58796b9e88 SHA-1: 1e74141c556e2eae62589213023a6051c5b63d62 SHA-256: aeda5490431b8382b2943434df885ee83f03ef4607d6f90eff0f03d8ad6cd5a2
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://kindeeyudee.com/ck_files/files/27116229254.pdf In PDF document text
    • http://drsuthichai.com/userfiles/files/63630885828.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/xibakekiwize.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/namoromolidagom.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145d23c9e98a---60432406788.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-19/20210919030354396220.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/sukive.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3aed03d118a68c7f8f2084a90ba6e152/nikipet.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/9tarkcouq2tdfm1i506vktmnt3/61011972765.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b35490313e---motul.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/wakoso.pdfIn PDF document text
    • https://perbloland.com/userfiles/file/80470172039.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/falowajekatiwifegegasafu.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/zabazimipigenosazifelozo.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/navepum.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/najiviforasu.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/wopuxixururokewo.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/bifejajukaxof.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/46880257222.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/kirobugazefejub.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16150a6bf2f437---79569850403.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/debufuvukekele.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/7752011148.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/wuparika.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b427203cf1f4ad3239800ea5c254214d/41818838419.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/rikirulutulanozubebep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+get+v+bucks+on+fortnitePDF 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_off0000b29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB1 10916 bytes
SHA-256: bbf33187cbe4927cd5c5e2f2893ea6e310ebea1b990749c87269c2ee76b6e129
font_02_sfnt_off0000e3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EB 16060 bytes
SHA-256: bb34f233f7027fb1c17064a0231450d19c3df9c76579375d6e929f2869c10896

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