Malicious PDF — malware analysis report

Static analysis result for SHA-256 613c9302369b9854…

MALICIOUS

PDF

87.7 KB Created: 2021-09-05 06:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4ef23b2f2944621c01a2709afff85d6f SHA-1: 817b7ec79b963e0d708ee55a1c5a45f860f37b7d SHA-256: 613c9302369b9854c5c1c22e5930528abcc6e88f3e04260d78765329e36386c9
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/siwibujusubomasuj.pdf In PDF document text
    • http://cochu.net/resimler/files/vegogobonakunejekoduluv.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ep1e2bt6gk343s5ale4sml1l62/86319847991.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/xigul.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f89df1d4e08b8d671dc3c2193f639925/lirovosigomuxorudasulag.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/suwatug.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160783064b6cd9---furamamuxesixisusotemavib.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/lavuzoludapirozebigumosuf.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/fuzotigofejojid.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d7988855d---nazedi.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50e3b5e24e---44774047604.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/43271957934.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/55721260027.pdfIn PDF document text
    • http://101balkon.ru/upload/files/80091162305.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609828477c981---bakozelojaxeruradumiwuvil.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/2c059212a06778830e48d38f4775f824/tijedufotukuketupaw.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1611fe702b4797---livep.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/5370003283.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/41071955095.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/58471401814.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/ruzamurezusunazepido.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078b750e1104---punilupem.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16086e77d49f7d---pofufelinamojabamif.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/35233132563.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/makonojogeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=manualidades+para+reutilizar+botellas+de+pl%C3%A1sticoPDF 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_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 19340 bytes
SHA-256: 27c29ddfd2507fbbef2ef3f948f0dc4cfe3c0d3f810def0e2041a23c01921887
font_01_sfnt_off00011d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13534 10980 bytes
SHA-256: b1cb87d829b2bf0a610818e67a26c0e70af829aa9f47531c86ffa1e3057d0810