Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd472963bc6b3d2c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 14:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9b5bf85668382b37f4302795e132a32 SHA-1: 98d3461dc326442e2ae6698b2977c1be09820822 SHA-256: dd472963bc6b3d2c1b8a1a133439148c1db04e24f07a49e5c0f6699da4c3e5c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=apk+live+football+tv+hd PDF link annotation
    • https://vieclamlaocai.vn/webroot/img/files/1519896302.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/751617516.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613382e040bfc---newobadituxelofi.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/ravarenijozu.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/galabawiwalugosumegixo.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/widomulomimiv.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/92301891278.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/vivawetagowazukabezefuw.pdfIn PDF document text
    • http://regcureguide.com/files/files/kovezunaxasirifalure.pdfIn PDF document text
    • http://mylodge-naoshima.com/poxopoxikubopasevag.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/jopifowemababi.pdfIn PDF document text
    • https://partnermind.cz/images/files/62688758797.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/pukizatuve.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d45b9adcc---90455737971.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/kesasupid.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/61235178979.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bc33e3636---dazidivodunulozefu.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/zitugewilunasetizi.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/gogepozo.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/15306590109.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/raguwenudonovo.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/zikizofiduxamurovudesivux.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130120cef591---kubidekokutikujexofigika.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/83004141575.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/57483839961.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_off0000e43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 18016 bytes
SHA-256: 2d7bb410a6e904b35d11a78075e37f2bf91a9d65e46acb3f39da639b0460ffc9
font_02_sfnt_off00012b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1B 10504 bytes
SHA-256: 4426633a070dc0f87b65fa6f3f8df98ad83736ed087492a3ba9baf1b5b572a4d

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