Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ef57ae27a50107…

MALICIOUS

PDF

73.4 KB Created: 2021-09-05 17:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 05a0c71e55a8223275348b0536c8d922 SHA-1: 632fec5dae25e481c2ee677b6814d499890a69f0 SHA-256: 62ef57ae27a50107f328aee51e767eaad96f28626809911c25c45aeefe994b4a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8496

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.
  • 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
  • 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://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0bc10b45---12527799054.pdf In PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611f7e6596c40---27078411506.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/ruxawamisewemujapajutulo.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/watimowasefagemitib.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/90894932555.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050415113378.pdfIn PDF document text
    • http://vswet.ru/f/17692042915.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/96635275741.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/felusaberabewomedaki.pdfIn PDF document text
    • http://malifer.hu/upload/file/vobukezigimadagowabosu.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608aaee67abc0---tagakapepurozutagiw.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ad2b62ddc2313fe1059252ad22e819b8/94399567218.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/402e0f1542984160c423e3f083aa2b61/25155795363.pdfIn PDF document text
    • http://schokozentrale.de/idata/85915331995.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/bilugetadol.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090888f9c735---51455903535.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/nudalofinor.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/4901422310.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757e8c7a8b3---titux.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/6781884672.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/38777937409.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/diroxiwogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fractions+worksheets+grade+5+pdf+with+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD243 17884 bytes
SHA-256: 842c72c7d2a1af62b0726dbde37ef7be277537386e47065bf1783c35b767cad6
font_01_sfnt_off000100ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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