Malicious PDF — malware analysis report

Static analysis result for SHA-256 505909cb5f86202b…

MALICIOUS

PDF

124.4 KB Created: 2021-07-02 03:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 183d7186887c3467d52624060bc945fb SHA-1: 76c5087f21d694c471ba6f683bbdcfceb9191653 SHA-256: 505909cb5f86202b017a0d8ccc4927ff43c3f3c229518420ab6dae9f5cf81fe8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://thebrownsfamilyreunion2008.com/clients/81208/File/92369324868.pdf In PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/vilomupewesa.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/38683532672.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f07ae724e8df65afd9990f42721d6018/tivat.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b40c10d2f4c82e65e9b066ed2a05a2bc/wamofaxafaxutulanubezej.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db6c1f6ec6a---totimiwekaxorotupabif.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/72996283827.pdfIn PDF document text
    • https://robertbah.si/files/file/dadujuvokegelolagitemes.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a33a8f6a41c021d6756a387a79ba9c16/zediribu.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/7435c4a1d5a4082df05253c9c5e793ad/38666947765.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/kusukoje.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/8673144217.pdfIn PDF document text
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/tefowubidipewixox.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16077ebac5a2a9---lavozigo.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/juzilubepaxupi.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16230678719927.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/8a6235b9446aafdcc64252259e2d77b9/88868974499.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/kulinajiviwezarefojipori.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/2a3ceffca8088137e656e637da4a18cc/58993264340.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/9296535252.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/banaxigunakepedip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=applications+of+statistics+and+probability+in+civil+engineering+pdfPDF 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_off00017b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B83 21164 bytes
SHA-256: 6d5c94c6d94720c99f33434fb5b2895447f831f31db43833ef32850a58c0777e
font_01_sfnt_off0001b016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B016 11096 bytes
SHA-256: 255171256e24b25ee80f54db32648c77a848bd9c345277053fb1ca452e047ea6
font_02_sfnt_off0001c9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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