Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8305750de493074…

MALICIOUS

PDF

73.6 KB Created: 2021-09-07 19:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 863fd29a62b48be124740e7b79238825 SHA-1: 44ab621ccd9de78a78e8035e514e6ba73e77a01d SHA-256: d8305750de4930747f0252a38605b46108ed3e4a8a24cd9eb9dd593077872cde
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to lead users to phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kede.org/userfiles/file/zopiga.pdf In PDF document text
    • https://zlataraburmevuckovic.com//files/danupodikomikuwu.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/62487889510.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/87495106818.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160817ea818b7d---41232315988.pdfIn PDF document text
    • http://calliopegoodrich.com/clients/73417/File/dizogap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0921164b22---92323813995.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/285904efad2461f9225241866daa3142/95373367978.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/55915502996.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1611930dc78211---wibododezijapoluwolubi.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4a5294f9---fenudibokubujebix.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/61337630479.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-31/20210731005117630552.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cr5r7l80e0d6lkjjnv4tp54kf2/gedewusu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ru1iamf2ivg471gag46vpdvka1/gemetakegoxenojevaz.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/21347375508.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/23290241116.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tibuxivajukejitopujif.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e771ad5ad---83890998854.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/27511749909.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/leluvufilanavedaginew.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6520d80ea6---49660487905.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161277196dd347---64349112410.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/59647955694.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e8420d6f4180e953ff039015dcf318d8/23550769442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bala+tripura+sundari+sahasranama+stotram+in+telugu+pdfPDF 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_off0000b800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB800 11096 bytes
SHA-256: 6937c7214db690111a8136cbbd5660e937bc1196b374c202f0174ef5e3317087
font_01_sfnt_off0000d172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD172 17896 bytes
SHA-256: 3c1b4bed31c38a482c43e2dd7d74656438fb47bc83040f004fd6db7fc67623c3
font_02_sfnt_off00010026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1