Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea9b699230aa79b…

MALICIOUS

PDF

101.5 KB Created: 2021-09-16 18:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 216d68b860104e91a3f5199cc958b66b SHA-1: 8c1a27ef73e8740731cbd778b10a2b1774214a42 SHA-256: 8ea9b699230aa79b9f8fcdd1f60ae63722fb799dd3541da40564550559a56860
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://huntic.ru/uplcv?utm_term=who+stalked+my+insta+profile+free PDF link annotation
    • http://www.jacenter.org/js/ckfinder/userfiles/files/5571623364.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/45cdd9e9d69ff6e903cc4507680cbb7f/57356572067.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/roxotizudodunimiwul.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ml35414o0c8mfqfq6pq3nd7ko2/95997140631.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614151c9996e1---3221994320.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/vawetaditatune.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/wujewiwibunuzogebofimuzos.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/72366921468.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/xajebusiki.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/57658009190.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/giwabusumuta.pdfIn PDF document text
    • https://krossi.ru/images/content/files/jazimajitabufowadedoxuk.pdfIn PDF document text
    • http://school15-tyumen.ru/f/tuwelifokamenexuturu.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/rutizemililijapo.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/62956896635.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/41650595949.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/fibisugodomarabakifilomu.pdfIn PDF document text
    • http://wdnederland.nl/file/vijisemewagid.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/kijemimulelal.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/28117618246.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210906125813.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/5388740190.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/xagukezazufufoded.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_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FED 18288 bytes
SHA-256: 13109f8885afd17a6030128aad73e2dcfb6fc2e088b2de570c26b327fe3ac507
font_02_sfnt_off00016f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F04 10960 bytes
SHA-256: cfd0c81071bf9af5b39d0df6d1231094361a6d4bc26e39e95add3a1c868f063d