Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5f5048060f0fc5…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 03:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 322e882f6566fca8043e428610b312db SHA-1: 648668e4f129a3f1c5ec649b08d0ce16e2a458b7 SHA-256: 7b5f5048060f0fc50e0d25a2fc006bd236fe2e49cf9efc85bcb716127e085ac4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload via the embedded JavaScript and the numerous links. The presence of PDF_JS and PDF_URI heuristics, along with the ML and AV detections, supports a high confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://asfalon.com/__files/file/nimukuxoligazerimes.pdf In PDF document text
    • http://bentleyplemtech.ru/userfiles/file/nitubugekisixe.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/21185168272.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4a22caa37---19662356809.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/tigisixavovoxusibozap.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/999ae4d13de0e3c5c2b908063159436a/21784307100.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/67383719742.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/xosigidu.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/26117622338.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/32786085922.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/12655469883.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/rawujeter.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/60436314283.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/nubuveganabutewozoxofuru.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/cvipkj8gkjp21fn5cgi7l4o2h3/12559687001.pdfIn PDF document text
    • http://slovoveri.org/userfiles/15305159450.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/65827594455.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219171557541268.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/21270954686.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/rugakugalopizifikotexunow.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/xotewitetijakademun.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/79352441477.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5815c9ac---26044167226.pdfIn PDF document text
    • http://clerus.hu/files/file/7258642764.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb70e8dc4---31404381377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+minecraft+beta+pocket+editionPDF 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_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6D 10932 bytes
SHA-256: c07cadfd4619de5560c3af5165b968e6b7794ce4119e330c27c4b74098ddb8ca
font_02_sfnt_off0001137e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137E 17052 bytes
SHA-256: 44aa7a5a033ba827e29996d48ea0d68909993568aeba80cdaad1deb845cd7739

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