Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d19debc2e0642f2…

MALICIOUS

PDF

93.0 KB Created: 2021-08-06 14:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 052c8c34029c262ff3b64aec7249d349 SHA-1: 8d6c38d5e77f27a1adb9e1ef9f4047f7acd607ea SHA-256: 1d19debc2e0642f2816e6b5a0d3f8c5152cf5f2c82df464fffe847bb072c105d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. 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 0.9925

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/t9eq9umhpklucfr9o6oauo3j6j/ledubotakujomewilafuki.pdf In PDF document text
    • http://iphysiology.ru/upload/botawu.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/73196180940.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/nirapuka.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/dezir.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/soluripekodupufogofax.pdfIn PDF document text
    • https://12tiga.com/contents//files/89567716324.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/10a36ef607f4b88ba9e608e3eac95e44/1757341733.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/riwuzexunojupat.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a09e88ac9b5---94036022546.pdfIn PDF document text
    • http://hogan1973.com/clients/d/d4/d4eda5e2427b34f3a15374adde9a77da/File/41204905496.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/53897ud69n26e8k41eolr87jf5/66464906052.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7c8a5101---76461414159.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796f6b557f9---35202523474.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/juwutudodi.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/34941864382.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/5gkkktmpk25v5941dhkmksv2r8/76107631954.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/86066295562.pdfIn PDF document text
    • https://ebooksweb.net/files/file/54630232792.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/35e9e555a4ead861dc8f101ec6d31f29/nebimidovizirizija.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/11412112566.pdfIn PDF document text
    • http://weiddy.com/uploads//files/202108040800384481.pdfIn PDF document text
    • https://best-label.com/upload/files/nunuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=asus+rog+phone+game+center+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001090e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090E 17348 bytes
SHA-256: 95ea90ebde70efad37df9160243a040791f27427afa4809a9435b1e9cde5f1c8
font_02_sfnt_off0001368c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368C 10856 bytes
SHA-256: ff3dd3ca1283631b9c3755194a5abf0c84a8341b8ad246a39df776862bc2bc91
font_03_sfnt_off00014f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F82 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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