Malicious PDF — malware analysis report

Static analysis result for SHA-256 663f23d77f375ba8…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 03:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ac6666ceebafa7bf3663df0779eb0598 SHA-1: 9c9de9bc859ab3d9a3c9846f1683253c54e68435 SHA-256: 663f23d77f375ba8cc85a5b6fff42f7a7c11c85bf28be44496f5f1cf95c7eca5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or are part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The document's structure and URL patterns suggest it's intended as a lure, possibly disguised as a file download or information link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=clash+of+clans+mod+apk+2020+unlimited+everything+download PDF link annotation
    • http://christschoolblr.in/userfiles/file/kevesanok.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/zajegogawunoro.pdfIn PDF document text
    • http://alkanboya.com/files/file///gikamazerufasu.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210905_231057.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/52983934691.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/xekuwo.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tumikalitebevo.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/xugugu.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/28751324974.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161330437a1a40---nebipodamebefezorarojif.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/35329816547.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/busovovimibonos.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/bovuxemezuxid.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/0635493cd349197f4c9e153d19059459/sovoletu.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///53047696057.pdfIn PDF document text
    • http://timocomputer.cz/files/file/mibefogukijonibubofile.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/24229538115.pdfIn PDF document text
    • https://agatanorek.com/files/file/befedobisotumuwebegat.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/bodute.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631949368.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6a4996ec8---zajufokeze.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210909082734.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/desebanosopamaxaz.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/dopekidexib.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/44412680636.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_off0000cf60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF60 11800 bytes
SHA-256: 8e366fcd40abe7b84658009fb986f2e9b51a8d080660d18656a1a5034cbf3330
font_01_sfnt_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 17152 bytes
SHA-256: 31256958bee5bda5059848016a4e039adad69f852712d85ad381d12e7d32829d
font_02_sfnt_off00011770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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