Malicious PDF — malware analysis report

Static analysis result for SHA-256 9993b0b6a7d790d1…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 10:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68c8d13c09c0ff4a67fb70f746d12e0f SHA-1: f3fbd4c8a7db36237d32b29e72640042d87c37b2 SHA-256: 9993b0b6a7d790d135802795c65e9f13a7b1b85f8af83f4ff7278316b52d372b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm pointing to numerous disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

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 http://tsnpharma.com/upload/files/92477567069.pdf In PDF document text
    • http://southerncross-ex.com/images/blog/file/rigunowubidulewodobula.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/98959120851.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f4573afc6---damegaburusep.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/60904149335.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/wuketigopagewemak.pdfIn PDF document text
    • https://educhina.mn/editor/files/16434958016.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/tazevegufumerukex.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/53099691304.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/16302404499.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/95613748406.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/28800521387.pdfIn PDF document text
    • http://elsped.hu/files/file/kinaloxugas.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/76210480477.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/3433301872.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/34303364575.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/1379753196.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ccde03753---kenegidodanowu.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/nibisawoxikizof.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/wuromalikilug.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/wakilukapa.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/rometiravobemubokodijip.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109101145534487.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/74354420306.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ad94374ba983dd053145eba8faed1dcb/91261506386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=tutorial+whatsapp+androidPDF 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_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 10508 bytes
SHA-256: 4d29718af990331e3beaabda4f47ce409c8f349f8a6216345f3b089023f0cf3b
font_02_sfnt_off00010ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 17628 bytes
SHA-256: fa388d47bb1e2c5d3e93a59c34972a022564edc9baccc0a3189a103643fb873d

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