Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda379fd90fe3598…

MALICIOUS

PDF

78.2 KB Created: 2021-10-01 23:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8e78039c9f6ed9fd1b1331f6b867f2c1 SHA-1: 085a213a68cc5d4d101a70c0f41aba727c1c0877 SHA-256: fda379fd90fe3598975b1cf543bf1d6de937b7a7578d98ef1ef4a274ce48c575
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also functions as a link farm, directing users to various compromised websites and potentially disposable hosting domains. These links are likely intended to lead users to phishing pages or download further malicious payloads, as indicated by the ClamAV detection and ML classifier flagging it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://huntic.ru/uplcv?utm_term=atomic+structure+packet+answer+key PDF link annotation
    • http://hotelbellevuepalermo.com/userfiles/files/taxiwow.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161533f47951ba---7371964117.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/jaxafosizuwupipumesogugew.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/90702923412.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/tevom.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/60620094187.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/zimokewusixevolusom.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/kipixur.pdfIn PDF document text
    • http://vtaky.sk/media/file/62264675859.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151c6d4d7589---wobow.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/63765820803.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/71794962475.pdfIn PDF document text
    • https://tpk-m.ru/files/file/pexop.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/7edde6c8d3bc54803bab5ed2601fdc96/32353900977.pdfIn PDF document text
    • http://hmed.vn/upload/files/walikotakolavipexapufivi.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/tumatomevimimukonuja.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/1954522975.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/kugulopedu.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/jafiro.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///lazatirojifodufejudavepo.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/tozixepebejetudane.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/xinixipez.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2F 18160 bytes
SHA-256: 83f17777edaf76652a4b3009211a8dab2a50b43693b881884adaf5ba1e793d2d
font_02_sfnt_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off00010f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6F 10864 bytes
SHA-256: 483e94e2c0712e1bcb79269a56d9cccdb815281bbe042dd119df68882a8fbcae

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