Malicious PDF — malware analysis report

Static analysis result for SHA-256 746e3c68180d96dd…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 17:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 35c0e5fbd8a02da549c45c652890c8d3 SHA-1: 1cc432bf399a2351a81ea2b88e8c5d3efdd6196f SHA-256: 746e3c68180d96dd19a93ed78d49be1466bd73a1b713ece9416e60d6ce378e76
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate maliciousness, and the structure suggests it's intended to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nyig.com/files/file/20698866524.pdf In PDF document text
    • https://branchennachweis.eu/userfiles/file/majod.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/bifiwuxasopujaga.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/vegizamarebekisafif.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/vuruwobuvepesanuridagux.pdfIn PDF document text
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/76136559502.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/jikovonesufabaj.pdfIn PDF document text
    • https://preciseenergygroup.com/media/74514603830.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/8845299664.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/29582371874.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a55f797936b---40242006557.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/41183678573.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/jp8tkupmpn8qn4dj73pc2v2ga4/vavuginegokadikumatofo.pdfIn PDF document text
    • http://oodow.cn/upload/file/210706110342736838dg0ohrhefbnm.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/suwaz.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/kutonari.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/4a518dbae41b3bb271f75ef1df61a763/12120685524.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/88809525062.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4738496f2---96883691555.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/wuputokam.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/65431224907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=destination+wedding+movie+script+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_off0000d0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 11068 bytes
SHA-256: 530f208cb41654685f38bf21ea9409c70734a7a7d8eab570db4c1a5ba06bbb8e
font_02_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 17628 bytes
SHA-256: 779ac2c58052776bcb44f9de3736c81b6900bc6026af5e0c628184019d2763c5