Malicious PDF — malware analysis report

Static analysis result for SHA-256 c732a68290af96ce…

MALICIOUS

PDF

92.7 KB Created: 2021-09-19 13:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e2fe376328d7ecd611837e5fd99c5006 SHA-1: abf0b00d17eb12a132c7575fea099428148f055b SHA-256: c732a68290af96ce0d961e48b6ae0ae6f9457fa5eef1aadbbc4fdd01625e49be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are part of link farms hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://infrive.ru/uplcv?utm_term=wonder+woman+1984+full+movie+watch+now PDF link annotation
    • http://gibisch.org/files/files/sisibomamalagesigenivokis.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/rogupatok.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16133b94538a24---40972668027.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/63320566707.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9af8c1ecd---20771722141.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210909_140912.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/47833761358.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145263695055---gerifem.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/4278463671.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/91667920120.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161361122dedb1---vozanoraribadugigibupunek.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/dosinira.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613e5b1a2346e.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/bogavunexi.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/kexofodubipet.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416c82a8546---temogi.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/17116768198.pdfIn PDF document text
    • http://orthodoxnews.us/file/vozom.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/xesumasajizafigadufudem.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/nubix.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///jadowutipawo.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/45091153038.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/5143239161.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/mologuvineluwebefatoxulef.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_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 11324 bytes
SHA-256: 3274f9f0df4cf4741a15e4c723675f2678684152641b3437557a0ee599ad5be7
font_01_sfnt_off00011f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7C 17968 bytes
SHA-256: 05ba3fa70705b9b421bdd31a39643c9392707bc55fbce6f2693919809d7a6b1c
font_02_sfnt_off00014d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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