Malicious PDF — malware analysis report

Static analysis result for SHA-256 747ce8d678ae2245…

MALICIOUS

PDF

68.3 KB Created: 2021-10-03 04:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 53de5f9a48fa5f8447b75f5cf610818b SHA-1: 694e0dcbff203b0f1499b52ddbadfbf8d914e834 SHA-256: 747ce8d678ae2245c07bbc3151cac1b80cb5e12699f30c25783edf55ed15cb66
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress upload directories or disposable hosting. These links are likely intended to redirect the user to malicious sites for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • 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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161438e5b8009b---63132660487.pdf In PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/73765771156.pdfIn PDF document text
    • http://mebco.ru/images/file/dogawewotemaxiwelur.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161449cfb757fb---45363101628.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161424e4b7b6a0---53510909334.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/91248641883.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/wejorevad.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/xiwoxilose.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/bopuxa.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/jimove.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/gukudevadiwagaxuleliw.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/7651274478.pdfIn PDF document text
    • http://santabruna.cl/upload/file/rasede.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/domasugeruxogusito.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/zetulijomiratukoge.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/99901712277.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/55711170352.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/jefuzemezipoxavutebugera.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/bapamanobumisizamadaseka.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/86674054017.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/mimobisezizevofosulibesip.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/xavaburalusepozibawilek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=scope+of+employees+state+insurance+act+1948PDF 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_off0000ad36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD36 11436 bytes
SHA-256: 0640393451f97ca8a00bba70fe39395c7a789c2a48efcdf6d577d78c37f1694a
font_01_sfnt_off0000c84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84E 14324 bytes
SHA-256: 86f519f837a162dbde08f3f20eb235430944a7acf9fa0d23802d34daa064d911
font_02_sfnt_off0000ebdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1