Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8521a9e3be4e812…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 18:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f9f729f0fa614b3b3308d57ffa040aa SHA-1: 60709703e5d2ae64c99594c70524b0d5e06aff48 SHA-256: e8521a9e3be4e812072cf48e18d711878aa5d04202001bfaa2e5797b734e1626
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware or visiting phishing pages. Embedded JavaScript streams are present, which could be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wadsoda.com/UserFiles/File/vukipur.pdf In PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6136f18cc688c.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/popunalubatodejatopa.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/72039701798.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/96376944379.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/jutojofuxi.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/nagatukipamojar.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613755fdaaad6---28784935638.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/89694961115.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/818505818.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///73483337448.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/muzojujagudes.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/puvuwosow.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/gakavowuwisejopamozali.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/459a56ac62d5c9eb9e0627eb9a9c68a5/rukolijusefabeziwazavepu.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ab630436a0cefdf75a839ea79fe37216/71841917834.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/rubor.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/xupiduzuxozuf.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/depoteziterovotafigupibuv.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/68313693590.pdfIn PDF document text
    • https://mbbs.hr/files/50690775799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=illustrator+print+to+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_off0000e397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAE 10408 bytes
SHA-256: 3ed835a67ca62a957086276472557a5513fa3c710f1bb6c6488147a37c865bbe
font_02_sfnt_off0001134e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 17352 bytes
SHA-256: a338d69ceaa0894b2005e7371b2934076bc98ea3b7d0bf87d82f4021ae90c117

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