Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ebbe6a5be0bdec…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 13:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c423bc31e3a10c5ff47dd880c6fe83e SHA-1: 11f8e359ea1edade92320b3488504e5cd456fd7f SHA-256: 74ebbe6a5be0bdec1a4ac4ab487646165991adc08253442c3e068111a7bee9b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting. The presence of a link farm, coupled with the ClamAV detection and ML classifier flagging, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=gta+san+andreas+v2+apk PDF link annotation
    • https://naveenent.com/administrator/imagetemp/file/84031345023.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/ridexatuvofoxizizafane.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/mesepularixofanupobitoje.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/kapagatofulidefon.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed2a12c798---34161122546.pdfIn PDF document text
    • https://mfdesign.hu/files/file/39047449012.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/kobuxatevuzuv.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/jazigulimipenusekefetepeg.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/27578042136.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/generuw.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/rigeluditudaxodi.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/87336979368.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c7bbd593547d0be92966dba8677d9aba/507186365.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/sumaba.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/wowumazaxelek.pdfIn PDF document text
    • http://xenangheli.vn/public/files/44667832898.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/wivib.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd499c91a---85914319017.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/bibunenikenob.pdfIn PDF document text
    • http://bubb.cn/up_file/file/pupuvubenigifikajeguwi.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/5ea9df79aa8b222bbf6dd09ae62ced63/53192769105.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/dikisepubiwisokabax.pdfIn PDF document text
    • http://enewind.com/pliki/file/fugazidorenapewatizesa.pdfIn PDF document text
    • http://prota.ru/upload/files/59823248721.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/famukewipudiveziguwavog.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_off0000d924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD924 10444 bytes
SHA-256: c57e6e5b3ed2edf6df28f64135e2aa5e9e3c212c2cc6186da8d7c5dfd2e34678
font_01_sfnt_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 17560 bytes
SHA-256: 094e00a5ddb223ce0fda5c2a8a9645847af14d3b0039d664486133d931c874ef
font_02_sfnt_off00011ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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