Malicious PDF — malware analysis report

Static analysis result for SHA-256 52af544d2dd6d2ad…

MALICIOUS

PDF

76.1 KB Created: 2021-09-15 17:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f12ce1e14bbfd0b6f95b58f39c7f0157 SHA-1: a518c0502b2733e68bfbc7329754ce3979fc90b0 SHA-256: 52af544d2dd6d2ad88a4649a01b3e85ed09f642b41501d249b6c87229a216615
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. The heuristic 'PDF_JS: Embedded JS stream' confirms this. The embedded JavaScript likely redirects users to external URLs, as indicated by the 'PDF_URI' and 'EMBEDDED_URL' heuristics, and the numerous URLs extracted. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent, classifying the file as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://irlanc.ru/uplcv?utm_term=what+does+phonetic PDF link annotation
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/13168149758.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/34894616894.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/jovovawobezomusuvidosaxa.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/xalasumovatedivawa.pdfIn PDF document text
    • http://eternoohydro.com/d/files/32657839179.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/xaxidigubofebavo.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ccuc3l5neq8omnpledk5ua4m3p/64819642247.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/melukisupekupo.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/kimol.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/56219486806.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/48151096526.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325fe3538a7---45258331025.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/72231555445.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/savago.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/9721311130.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/82948107218.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/73280272864.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/67580862366.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/kisupexe.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/15019221353.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/tonuxodidatirixavolipabu.pdfIn PDF document text
    • http://pbpharm.com/upload/files/57970022860.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/tanegoxepofozukisid.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/17184893947.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/42331133749.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325bbc4c525---16310787188.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/23460906868.pdfIn PDF document text
    • 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_off0000c6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BE 10460 bytes
SHA-256: cfe193e105df8cca9891593df983c444b35ad4ac4a17c332eaa0250ea183ca8c
font_01_sfnt_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 17508 bytes
SHA-256: 27df60e578f4869e0a7fc693202417af77e8e77251ff205173eb84304e16ff7b
font_02_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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