Malicious PDF — malware analysis report

Static analysis result for SHA-256 834fcae9951a52ca…

MALICIOUS

PDF

85.8 KB Created: 2021-09-22 11:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e3ad590148881f4b51c2f9c19889cc42 SHA-1: cdda276fb002a719fe1980be282ac3c22d77d11d SHA-256: 834fcae9951a52caf1e6da29dfe0410c50f3b78e3d2d66167a28fd9881923261
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://littlepearlbooks.in/data/eimages/file/22165892319.pdf In PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/rujukuxuk.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/20980703266.pdfIn PDF document text
    • http://446888.top/userfiles/file/76778143948.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/retinulo.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/7550000234.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339badcf706---37371113990.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/25373539805.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5b6938686---50743995052.pdfIn PDF document text
    • https://menu2uplus.com/images/file/rakukumexevubawad.pdfIn PDF document text
    • http://gdgom.com/upload/file/2109180154286742519e0isjb01cvt.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/lolasorutogixanekapa.pdfIn PDF document text
    • http://letnaterasa.customreal.sk/data/files/beravuwipezagejidipa.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/66354503607.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/fumaxafesorufumupu.pdfIn PDF document text
    • https://umutfm.com/resimler/files/42674499094.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/96114756238.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/16bb4a7f23062d114602e19c4e25b8ad/boforuxesuxurupinana.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/51728761294.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d45314db0---pukatukudewuvetopedusilon.pdfIn PDF document text
    • http://odumakus.com/uploads/files/10435841518.pdfIn PDF document text
    • http://deltools.com/userfiles/file/56090378072.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/95902799047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hide+app+icon+in+androidPDF 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_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 17180 bytes
SHA-256: 2116ad84250cacd6c035e2cb3b4c309197b203a1a4d40998d0b015ba8d97e818
font_02_sfnt_off000132aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AA 10188 bytes
SHA-256: dcd338da10abea697c29a09080fd0b46d2ac80a01239bb1ef58669f7d0164401

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