Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cac7c9ad9a22288…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 00:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21ad9c588f2db3672e919a08bf02fcd0 SHA-1: 3bb3e113c7fde2c67307d34c27f3e91330592393 SHA-256: 8cac7c9ad9a2228861cb9869c953bd5ee5f7fb12dc304072245335c6b5ecc5a2
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7573

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 https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/aa606e0f25f356f4997bf284e23f1e96/riziw.pdf In PDF document text
    • https://heatingboiler.ca/fck_upload/file/xifipuk.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/7i7hscbi26e161gdf3erc9cq45/gedimekoj.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/63676746549.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/88943079860.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/46224725769.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/xafadirimuretafutiwe.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/bijisivakagudixakozu.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4782531a0b---57192077906.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/69908075097.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/11362970479.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/18688967378.pdfIn PDF document text
    • http://jp-cable.com/d/files/80565028089.pdfIn PDF document text
    • https://chp-travel.ir/data/file/28949435246.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/birizasolon.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/jatakatebitatifatijopuvif.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/2489101570.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852c1d8d573---netigivixixuvaxiwegok.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4abe79223---15212213991.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/75147696493.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/pagisefobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+mosey+hotel+williamsvillePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 17712 bytes
SHA-256: 507514d89aa2a74a2e36206818bd42765b6941ea8213b3f92ad2aed21b81e3fa

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