Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b093f20dd1cce4…

MALICIOUS

PDF

98.4 KB Created: 2021-08-19 03:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e81b0d449b26c188ec71a3a562eb5f4 SHA-1: 586aeca0a68f14b57a14eb46e10a00c10384af4a SHA-256: 85b093f20dd1cce4672fa08c39154ab3700597baf5627ecc4fcce7e62bd301da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://aivieksteslaivas.lv/userfiles/file/54024848726.pdf In PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ade3919d0---zokopiwobifefekis.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b8570f4d8---fixaten.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/j5a2347ssfthmke5c2g72d82oq/8774741431.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/6454498197.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d47d96c03ed---52194392969.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0492ca4e08c524271e966badc83869aa/72124073466.pdfIn PDF document text
    • https://dprkoreatour.com/uploads/files/82295507299.pdfIn PDF document text
    • http://siembra.me/uploads/files/53582481412.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/lubebigebefirepebelaripo.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/bozefugotofobixopob.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/88913d1ad00fe3ead859d202fc2a6e40/4852015425.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070e39f7e0e5---78440015552.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160883d61c4f9c---tupikesegiludebubetug.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/e3b783e5e1a358247895d7ac3d8dc15f/25979441495.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/felovodawofugazag.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/48177631596.pdfIn PDF document text
    • http://e-hane.com/files/werumakobukosafoxi.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/86712086438.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/3955ec587c0659934f23a052a0d3eb58/kovegufilodokidas.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/zibamunuvavokagibopowum.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/rv9a4t0krbmv1sd5ehq0nh1ehm/dusoveze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=introducci%C3%B3n+al+estudio+de+la+teor%C3%ADa+general+del+procesoPDF 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_off00011891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000130a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A8 10940 bytes
SHA-256: 99920d9002466176ea8b95c3beca8cf73bc871bf08457788f5b3bc9ceb39e93b
font_02_sfnt_off0001499b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1499B 18280 bytes
SHA-256: e733e61e6a096ea86cfd86696b7294fbda5499d05bfdf67a596f01d14f3f475b

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