Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb112253d2ee4a9…

MALICIOUS

PDF

87.2 KB Created: 2021-09-13 16:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 377a26a7c1e6ced2a05b05c735b05e4d SHA-1: 0a133edf35984ba467c73a514ef864f8ffee3cc4 SHA-256: 9bb112253d2ee4a9b487e0065dcf2a51e66a0f5390a757f76fc8d132b623cf25
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs, such as http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613026ba1aec6---39288459133.pdf, are likely used to distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nayyaralidada.net/alpha/ckfinder/userfiles/files/23948893126.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376d69d20d2---14224902810.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2cb1615ea---juzasadixovifudabifezaz.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/vapaginadipajodafuzavap.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/sirozogumukazebakigitafe.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613026ba1aec6---39288459133.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/fimepuxumebuz.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109101831377411.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/40091298930.pdfIn PDF document text
    • http://metallpress.info/files/55333739974.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/51580292229.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/rizizatenujagatez.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/37338024852.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/26036242315.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/80426743399.pdfIn PDF document text
    • http://rnralpha.cz/res/file/dawafeturamod.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/89242192747.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/xufakejawoxusitutunarew.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/jodosasovujura.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/baforifiwekezavigadujewu.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/lemokigixuwo.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/tasesesokoxexivi.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/27518435425.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/ninane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=kingroot+android+7.1PDF 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_off0000e49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49B 10236 bytes
SHA-256: 26d1fdebddf31323990985f5f506e6fa433101abbe87f4a80bf29e71a7a8fcde
font_01_sfnt_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 23452 bytes
SHA-256: 28361957e67ec6d9b44bb3466739cd419fef80659e01387f053d30ff067522aa
font_02_sfnt_off00013708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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