Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9de52f08ee5f44…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 15:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 542f4f0963ebe458472aa303a2189048 SHA-1: 9159e561fd13136e2984ebeb2fe28a9cb5a70bb3 SHA-256: be9de52f08ee5f4440cdf84fedcde321891f3277c7f52012c1ec7f8745a7b29c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the embedded links.

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://cmflower-kkc.com/ckfinder/userfiles/files/zexusidoguzuje.pdf In PDF document text
    • https://angem.fr/userfiles/file/98377894273.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/kopelorafaboturob.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/motoxafarixuvuramezoxub.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/vafikotoruxeduvi.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/2ah5pke6a5ah374fefdh7t6u8n/72276777753.pdfIn PDF document text
    • http://panova-art.com/files/file/65052074337.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/foviraxowifede.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613970ac6c02c---79160962029.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/jesomirafujenifazototifew.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/mutagejajerexorobuw.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/43139577306.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613346ed9f59d---xijefom.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62004636710.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/rabatosibazipivunixazajen.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/43181210921.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210903_031208.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/pejewobovixativovi.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/22579147574.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/55094591256.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/9fdthqvc9vnq14r6dburgsmbt4/sajigetujusedazabar.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/3785626496.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-11/20210911212934568742.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/wejetonufalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=como+cambiar+imei+androidPDF 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_off0000e61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 18612 bytes
SHA-256: b901930f26f52202e0712347578f539428e6ed785cbb63932b65bdcd9a413921
font_01_sfnt_off00011567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7E 10388 bytes
SHA-256: 509ddfb97837cf31adbb32bb073339d23e0975a3fcbcf1d35a55b8125b699357