Malicious PDF — malware analysis report

Static analysis result for SHA-256 227c385472144073…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 06:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be94e53fb80cfe9cbf07287774df1852 SHA-1: 728cb8fa7cf8a6cc435ff5c14254abfba598eafa SHA-256: 227c38547214407375ebc861ddb13785ecb7ef3ac607719053fe057e9efdf070
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also includes numerous external links, some pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sgo-bage.com/public/files/files/84381366880.pdf In PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161400d179baa1---zebimamijedunebibut.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/97845967464.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/48804991682.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/wuposofavalemajizo.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/5c0a34fa5339d2201ec911f23dc1d020/kunaxovo.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/vinig.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/jejalori.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/51140992593.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/denevamab.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff9a5e20b5---27127292716.pdfIn PDF document text
    • http://vhshf.de/File/zosupegigun.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/vikulijokal.pdfIn PDF document text
    • http://email-database.info/userfiles/file/puzuvebemawe.pdfIn PDF document text
    • http://blgjad.com/upload/files/kikasasijevizibotuv.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/55826779180.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/supin.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/jiveju.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/46217011361.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/rapusegolobawa.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/21991751460.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/76662307394.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/liputivebegipib.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/12284964715.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/pajom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+secret+life+of+walter+mitty+full+movie+onlinePDF 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_off0000d4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 18348 bytes
SHA-256: 667d57b0a728bf1ffc0e29a9012af20e331a136d4fd9c539a937689532d54799
font_01_sfnt_off00010412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 10932 bytes
SHA-256: 2d5a9337feb3aa89be6ac81a6ca4542d8917435c5fc07100a5a2992823299b39
font_02_sfnt_off00011d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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