Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d3195a3ce32e2f…

MALICIOUS

PDF

72.0 KB Created: 2021-09-14 23:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9323ddd3a9e6542dff365a2fc3a6d81a SHA-1: 29ea076ac3eac3800336f636a4f595c86602abc9 SHA-256: 45d3195a3ce32e2fd0bdf5fc37b3d390ab86becc3911797724d0252598739726
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS uploads or disposable domains. The primary goal appears to be directing users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ekorepetycje.eu/Upload/file/3898847911.pdf In PDF document text
    • https://namphuctourist.com/userfiles/file/debavosawonosuzopazero.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/xiger.pdfIn PDF document text
    • https://huanghecables.com/d/files/rolerikokavubegufuvi.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/kaponazakuremalamujanujem.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd60c6d028---ziwunipavafizetisoruti.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/pigezisiwikol.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/xigawidatudagevonubupix.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/48612188889.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/2571190909.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/lifulitexi.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/83448442480.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/sakenusu.pdfIn PDF document text
    • http://minipit.com/data/files/rimuxavutasuzibodobebukur.pdfIn PDF document text
    • http://www.77ice.com/upload/files/56195511782.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd6695859---nojimujagefibeba.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/mujosi.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/fcb519b2737b3bfde4cdae671eab408e/65174365569.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/visaxusiwitesitovid.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/tigotirepajofugibak.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/delifa.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/federetemakabe.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/zaputidoborodobamivuveb.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/fupabebavedisokebapomax.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/381f829b23fc16f081897454b9d471cb/56979967156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=all+samsung+frp+remove+toolPDF 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_off0000b812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD024 16272 bytes
SHA-256: ca243118997b540ac6fbf9792e7e7f04a17644e42291c1de747b57cc1d28169d
font_02_sfnt_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 10756 bytes
SHA-256: 4cba52dd7883271c60847bd268c4757523519d783d9fe0465e2b8ca82a713a2b

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