Malicious PDF — malware analysis report

Static analysis result for SHA-256 74cd72ae9aae27be…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 10:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e1d0948c2fc82f6cc5cb8f48b3bfc5e7 SHA-1: d7beafb8cdb218aa08e3f256076ddb238bea6a6a SHA-256: 74cd72ae9aae27bebbcead56714c837f4275e9b6a4b9d032b3a7f9dee8c32138
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, some hosted on compromised CMS uploads, which are likely used to redirect users to phishing sites or download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 https://sthouseluxury.com/upload/files/kazabezurokekojadupifawas.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/58cn1e9rerglsmfr7n3lintmf9/tolubalulane.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336ea946901---29343381341.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/43939497407.pdfIn PDF document text
    • http://prosquash.by/data/61975957554.pdfIn PDF document text
    • http://halmar.info/userfiles/file/57744389014.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ca94b2940---48082053615.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/kefatixoma.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/gesupopogefabewutuw.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/mizig.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/wojagejevavivolopeli.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/mipapaxagevupixeb.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/wabugasi.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/jidipotepusavabesum.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/zubewipuzakezinuk.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/nijukapunobiberujewapetun.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/letagajuse.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/59978513902.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210901165251_1858732235.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/tejurakonalotexo.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/wozazifisala.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/tuvobemagus.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/mopipezamibisumetojoni.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/6163408076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+magdalen+manuscript+pdfPDF 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_off0000dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 11008 bytes
SHA-256: 879b874aa3cd8b9491a35eed9e1811afc98eab80e04b743bdcbd21374fd951e8
font_01_sfnt_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8D 21112 bytes
SHA-256: afb0fa3215ebb03970362e604afa872915c3026c9264ca40cf237c4ca4887dfa

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