Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e2c9113c5a52f6e…

MALICIOUS

PDF

84.0 KB Created: 2021-10-15 09:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b5b781ec8852c75652f1c16295e13f2c SHA-1: c408ef6e23ec67c3a4d44a69fe4427bf365a90bd SHA-256: 9e2c9113c5a52f6e898cdb024ebdbbbd9f47b0665ca2f58944958b0453cc675e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external URIs and is identified as a link farm pointing to compromised CMS uploads and disposable hosting. An embedded JavaScript stream was also detected, suggesting potential malicious scripting capabilities. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medigroupvn.com/upload/files/lowuvono.pdf In PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/54695951261.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/muzazuzadekexutejo.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/65939329050.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/pekifubarekaze.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615ec30c08019---nabovogaropejirin.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/gepikosam.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/13357272420.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202110060408385027.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5d43782f3---xifepovezijitukaw.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/janufulazegiwefimidafew.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/3905099461.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/tekepika.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/3289295819.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/pesotig.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/zikenikevabejulov.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/88ae80b11ce39d7f152e54cd09aaa244/buxeditokewizo.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/41252279541.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/21902280660.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/61414984692.pdfIn PDF document text
    • http://nfc.soo.jp/file/tatogivusovujirakaja.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/99976332834.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d407929a3b---vinegivofalaponusogetasan.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16164a5756f3b3---xuwifenet.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/5bhJmFgkeCE/uplcv?utm_term=overlay+2+imagesPDF 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_off0000e1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0A 10456 bytes
SHA-256: 1573a847eb9a92b5abeef5b7c9de49a026b6a840b4b0bf70ea1eefa880fc3232
font_02_sfnt_off000111df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 18300 bytes
SHA-256: 17d863c25c50d278d4e0f650bacc8ba6d19c15581d5a371db0b8f591d9c3fa0d

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