Malicious PDF — malware analysis report

Static analysis result for SHA-256 4788d3f62abfb20f…

MALICIOUS

PDF

78.6 KB Created: 2021-07-31 01:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 219dc7a231936b8097945330c6e4f684 SHA-1: f7a4e37edf50052ae60e1432fe0fdeacb6825c04 SHA-256: 4788d3f62abfb20f16319bb9d34723754eedb5610717977917b801ca60b339e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm with numerous external URIs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. Embedded JavaScript was also detected, likely used to facilitate these redirects or further obfuscate the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://laborke.ru/uplcv?utm_term=hard+reset+kindle+4+non+touch PDF link annotation
    • http://ccsl.asia/files/68276216930.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/sanokufukavisemoxitoka.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/nrd2f1k5evhuu8qslp6fkm28b0/dobunixumabiti.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0fd6e1ad86beefe3fbb8a38797d1f95c/30934358856.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/463a1e009cae1524e897b37accef4923/jinerexi.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/sdm3eivtrumgoq1kposrb7u5kb/56349209653.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/dibaxatuxalisuralibupux.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47680384235.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/51578107726.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a813eb7c17---42747267909.pdfIn PDF document text
    • https://anfauglir.com/images/file/26053093053.pdfIn PDF document text
    • http://ekotronic.eu/files/file/lifelop.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/goromulijo.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3ab7b3838---jokijun.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/witenutebavakodedib.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/79879017155.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210629_103C31E313F29795.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab4034af02---16624177358.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c825c4c6b---feketavirodapitutewatozi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/b92888298707adbaf53cc46b33cfbbf9/45186697343.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/xewewiwawuwenajaxazig.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/zoxesokuwukumoxonu.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_off0000d05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05D 16744 bytes
SHA-256: 9fabf3f248a9c6e755c578becb3a162ba83d607b51c8d7c21ce0b686166d104a
font_01_sfnt_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 10728 bytes
SHA-256: 0b8cab6c86cca6dc0cf2ff466ef19992121dcd778cccd5e93cc20c951221937b
font_02_sfnt_off00011468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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