Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d8b5abacc1672b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 07:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a44b21bcf845d0361c0e98070fd27d03 SHA-1: 53eec876860cde4f2a28feacbd1dce51e6b02b60 SHA-256: f5d8b5abacc1672bd46cb166eaebeb4d37f261ed68ecc8c157ad7a189699f71f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The embedded JavaScript may be used to further obfuscate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=top+app+locker PDF link annotation
    • https://tramhuonghanoi.vn/upload/files/96371205432.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/topufuxuwe.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/04f890cf2c64584c0fd7e4a40fcf1da6/82214958523.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140360cbfeeb---39382881535.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/71596967755.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/3805377878.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/waxemirulabeloxeputafaf.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/70069313657.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16133dee778280---dolavisufukatotujezozetun.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/nopesimimebufufodizuna.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/2530456616141bc023a2e4.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/dajebezupunasexopiri.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/namurirawuzomojujapex.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/82709459991.pdfIn PDF document text
    • https://bawauang.com/contents/files/powizagipo.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/rawot.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/50507515040.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/vojabudotapuwavuvureledaj.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/fexonurizizuxitanubuvesir.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/xafigofavobomud.pdfIn PDF document text
    • https://hyper.vessty.com/_img/files/84414336706.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/dirujiloz.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/jatugixudijorujo.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/velupolujipugagi.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/tozilavizefupuforovudusoz.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_off0000b4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B3 9960 bytes
SHA-256: 47221e45c2381c5d4550050f2e532b93f24bd146992d011b484281f0fa5b8db0
font_01_sfnt_off0000cadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADF 15972 bytes
SHA-256: 2d9c90e9bda16d1a8325b47886529c26206bb983ed00d60b0ec7bc1dffe84b8b
font_02_sfnt_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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