Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed1d20b5208ff85…

MALICIOUS

PDF

85.3 KB Created: 2021-08-23 14:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: b087df70f251f790e5e0d8f2dfdf5108 SHA-1: f842bd02ea7a8d6e5f3a86833d4a0aeb3588101d SHA-256: 5ed1d20b5208ff85558fbd41f733ee0773bada38a0706f5afbad50465f5fa451
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://djennebeads.com/nbloom/fckuploads/file/budakigimabedow.pdf In PDF document text
    • http://doudou.tw/userfiles/files/zuwejizesugexozudenuzaw.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/bamupumuvunogokexur.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160e83c8247fd2---86153193666.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f676665ab---lefasuxaduvewogos.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde3bf018c---72326693773.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/56780297258.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/wawat.pdfIn PDF document text
    • https://dalba.net/other_files/File/1639084030.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ehbagusi8l0ivuor5gdtvea412/55231102940.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8a7e3c7b097a738998604f6a4537ae88/tevuwijuka.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/purokekopefobakakafiwu.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/30618033398.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7484e35fb---sifivuligeposodosoguver.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/nilawute.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/wofisawakonur.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/95089397649.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/7075736566.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/96750704894.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/26802205181.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/1c12d947a7bd07b05a7232e64bc40926/xiladabot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+take+out+bracesPDF 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_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 10392 bytes
SHA-256: e63439d68baa24da571d872957a7f28172e0bc477921c1614492b9b7761c96a5
font_01_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 16684 bytes
SHA-256: 99209de59c353d058a374826abe6eaf2846a84e77f0a5d4dff5d22cc16999617

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