Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a430f4dba7534f0…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 06:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c39b6bafee850fbcd4311b5e3fac2412 SHA-1: b26deb604ad0b7dadc7d5b55e83412f80cd94dac SHA-256: 6a430f4dba7534f093fea495ae4d53e61a78c1a8e2f81c721e8388a3bc09329a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=tp+link+wifi+extender+ac1200+manual PDF link annotation
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/sefevivizewo.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104a44400150---166349315.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/51501553761.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/kejoxadesuku.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/4ef275gfvrmrjavne13a7u1he3/pizonazix.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/vefetido.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/6298690618.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f29790c6f---322761024.pdfIn PDF document text
    • http://reneenicoleevents.com/clients/865995/File/55707856565.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/firerojitisupepol.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/dejopifubewo.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/57530795160.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/87562122248.pdfIn PDF document text
    • http://rubensova16.cz/files/file/mizinarozadovumugeba.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/bugogawobavit.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fba9c3dca32851122fe7da935e7985c8/rawutapalu.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/36613652881.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca849d8357---tewuvozolizakirasufeb.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ca1d5fdeb---xuxigomovejam.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-5/20210505123100163897.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/38823369415.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/54700238483.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_off0000ea9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 19696 bytes
SHA-256: 0b2e0c05db7f6eeecb8900d9c63c959447224a1d7fff78fe277f4ef74740c433
font_02_sfnt_off00013562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13562 11132 bytes
SHA-256: 5a4aa6a8bb5635f8b8339c2461115e55aefd1b030a4f66e7f2eddad90b9f6cb7