Malicious PDF — malware analysis report

Static analysis result for SHA-256 8391f607aa721246…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 15:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e92808acf26f4f23c0bbd024e0f73434 SHA-1: 4f3f8614a995a86edeedb1c22ab7b35ccd591cea SHA-256: 8391f607aa721246f97e9c591f2276dfe1cbdc35a4fb696e727f583bd52f516e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://philabc.ru/uplcv?utm_term=how+to+take+stunning+digital+photography+pdf PDF link annotation
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126f4bab6c79---16736124678.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/fc380bc888c2648d08fc8c7afec9e842/zulipapirapabidoxud.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160edb45c253f4---32744869716.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/vosaxumew.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5ffea69be---xiluwevudureza.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/11054594425.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/87519487403.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/849323949d33ebc25f479700e996729f/94034083160.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca5758eede---57695849143.pdfIn PDF document text
    • https://hse.tw/upload/file/nubeferabunuzejifodo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/jakidomupoxonetavigewuvet.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/gixaxazoxomisumokevasafar.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7212d40c89---97214123289.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/maripenikemakejarakiz.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/29160029360.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/70aeac5cea520247f316de3bd0fe3e06/fukinixozir.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/655da032eb805bd2d3c6cdfa09e6eeca/23063153965.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/73404846445.pdfIn PDF document text
    • http://geose.ru/userfiles/file/zatapovaxaf.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/75905982291.pdfIn PDF document text
    • https://badoza.net/userfiles/file/segadojejiluximokupap.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_off0000d64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 11160 bytes
SHA-256: 7bbb691d76be1190bfa7c0d72c04bcfc73aec37f4c52c642783a4580afdeb23c
font_01_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 16620 bytes
SHA-256: e5a61529165c1c43edf1a350f8c6b80e73a3cf7113b117ff9fba2f0041ea7c97
font_02_sfnt_off00011b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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