Malicious PDF — malware analysis report

Static analysis result for SHA-256 86544b4e8f6e5184…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 08:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a52d0ef3838b3ff286eefb8ee8682caa SHA-1: c124a9189505681c09c81fc2efa9bc6af6201245 SHA-256: 86544b4e8f6e5184c9f2ea4cacfbb5e8f4e1f73f8770b7dd6b94c0c052c629f7
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which are part of a link farm pointing to disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF 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://crysiq.ru/uplcv?utm_term=a+quiet+place+2+release+date+online PDF link annotation
    • http://kleinschadenexpert.de/userfiles/file/vagatodisulanisox.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/7333097284.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e760442997---bofadirakivudaduseget.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/3079596191.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/wifuba.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/boluzubo.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7d5d1c6f30428f1ec746e1bff780c0fb/jidexopozu.pdfIn PDF document text
    • https://lordoptika.hu/files/files/podiponinutet.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613833d3065d2---rokiz.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/pobekizex.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/87524401761.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/zufemamozegiguxa.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/gimoliperutavelabidot.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/nozovumigeremira.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/jixojezom.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/4517803898.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/sowifokas.pdfIn PDF document text
    • http://newo.ru/files/files/bowebonemiwisowiroban.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/vomamiluloj.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139f8f06d5c3---69070702224.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/86690472050.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/58129190359.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/pesujawowefigak.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/39765751977.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/76799214299.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_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 17392 bytes
SHA-256: eeb2f6aea51643b236f94cd1f400c6161f4f88eb5307db9b15a1fbe9632dd778
font_01_sfnt_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 10856 bytes
SHA-256: 90ce3e6387bd4b2b7921c701df50257e066e772c7082be8d7426b51babca7af2

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