Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f29c7dd852a48e7…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 17:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b76d68d45486e3550c4356cfa7ab7b25 SHA-1: a8e73c271d77f0dc4b63b19c83c51fe8c26f4d9e SHA-256: 7f29c7dd852a48e788c28c7de4dfabe7bfcadbce7e41d3b0fff52158ce77f5cf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure and heuristic firings suggest it's designed to lure users into clicking these links, potentially leading to further compromise.

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://jan-fotografie.nl/upload/files/46163030532.pdf In PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/74118874525.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8552898b7ef4e9ab10caf936fa1867fb/xalivikoliposusivipuxop.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/befirotinibefozikapi.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/wobusapalexipaxokexevib.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/9360058817.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d62b8128a9e753b8003d0b8d366d6b25/pitatul.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8be137d667c38510d57907e87475fe17/37854660515.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/4df84b0ecba4bad9ccead33252e6c972.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/jozogefuvexudi.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d1df18157e396c41efd1290cea5a3257/mutaxu.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/55733536273.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/84946659751.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/lexijegibekeselomonam.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/rofinozegikamaxoxuxoja.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/13962568606.pdfIn PDF document text
    • http://weingut-suppan.at/files/kawogufaf.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/pilamuvapegagisaka.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/notizafosekiwujowusijox.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/97615525075.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/fobawogozirulexanafa.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/72217712044.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/zinexafi.pdfIn PDF document text
    • https://isleo.com/i_photos/file/85001313350.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fecd7c3e08e4ab6ba3f26c21c0b96aaf/22866855737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fifth+edition+player%27s+handbook+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_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 10952 bytes
SHA-256: f6b95cf830f8e886bebfb76519b8ec60f18442feb5847504abf922cd7e7b80ea
font_01_sfnt_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 17568 bytes
SHA-256: f4f3ea73cd165520ba1190857989045b588eeead5c960d76ad966a7aac6c90a3
font_02_sfnt_off00012e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1