Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf8bdf5da1998ad…

MALICIOUS

PDF

76.5 KB Created: 2021-08-06 10:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2e0b84aeb1f10856b9a122b2c1ae336c SHA-1: 8eb22cef201e056e1f1ca314365458912ce0e69b SHA-256: edf8bdf5da1998ad31321bfd617e798da89a8fae9926d337f9d36a6807faea17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites, many of which host further PDF files. This indicates a phishing or malware distribution scheme, likely using the embedded JavaScript to facilitate the redirection or download of malicious content. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://crysiq.ru/uplcv?utm_term=garbh+sanskar+book+pdf+free+download+in+hindi PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7210d1c513e9361d03d63bfb14ceb549/wanonidibomabesolowejusup.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b735682b8cdfca0ea04bb8828c8de6fa/74365066090.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37963af71---5579816403.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/pezupiw.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/73221069663.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/5585487199.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/76649159359.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/e410ba9795e0abfbfbe02455aa8af781/74395160780.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/sexafagenixudek.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/wegutenugibiz.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/loziregasuvewirufurupub.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/23551725273.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/tatojapuvonupugavumugap.pdfIn PDF document text
    • http://khocabien.com/uploads/files/42266344497.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c84a14eff---fuxukemekopudokigubumamez.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e75e733217dce21f6e83603ce45e0559/nozojamusojojekapir.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/nedonajaxi.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/nalurofusamivutab.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/behfab2ugl28l8bepmv3dk4da7/kifajuwul.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/4756117097.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/70579bef86f04213800b71520564001c/gowalasisagamogap.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f65d2c87f4---lomugitinavivimabikaz.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/86086494581.pdfIn PDF document text
    • http://alkanboya.com/files/file///88054736406.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2608c6349---76874300139.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6897cae26---24132627869.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/mivarisumuteju.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_off0000ccba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 10856 bytes
SHA-256: 09963b130d4b8f687dbacc3fd73269e099f56519b1b552a908f37b5500b04feb
font_02_sfnt_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 15236 bytes
SHA-256: 5a044471a5d3eccaff1c708f9c5731143452e9586b8ce11f70739c837c4dc236

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