Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb678ad7de3f6b5b…

MALICIOUS

PDF

87.0 KB Created: 2021-07-01 13:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3934a4c6494f8d2f03b00474a33da3e2 SHA-1: e24bfdd440ea593b230b853e7b710a3902b67a04 SHA-256: bb678ad7de3f6b5b450294f91be7d43dc8c036eb13f389f4f369bd89fa1364a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by multiple heuristics and an ML classifier. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/fe6708853eeedb5faf9e4c17f8e33230/21673800136.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/36e624a63b0187cdef57dc81a5954dbe/91413523123.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/bkapp3uttmimejnl9otqmnvcfb/37860802640.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3642d5e1804e3b15e6868d7bd86c5450/rukorarurodejusivut.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948b042591d---kijidelinewiwetabirat.pdf
    • http://anatolianlgs.com/userfiles/file/3984116519.pdf
    • http://zkojicin.cz/userfiles/file/jijujugalije.pdf
    • https://unosms.us/userfiles/file/35220052125.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/36920887466.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cc1cd4317---jewigofufuxewomizeraf.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/vstfte869rco8iusk2569aqjg0/1443932837.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1c430ae13---lutitidiv.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ce1eb94c---vedefelugopur.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160765d1602d2e---xivuzimovuvot.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8a6daec76---kisotozetalu.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa35b14a0f---moxopozirisisajowanux.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bc30ab0cf37---wefosileju.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c9f5274f4---pawejimosalejabisugi.pdf
    • http://studiotrusso.it/userfiles/files/zonoweruf.pdf
    • https://jajugroup.com/ckfinder/userfiles/files/71505174707.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608104d29eceb---80811540167.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071bed7368e3---72809637852.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160709d9ac0c74---tomamuxosizilino.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcf39dceea---gisakojawalubuma.pdf
    • https://al-farh-iq.com/upload/userfiles/file/64896953438.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=chocolate+count+or+noncount
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f480.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 16792 bytes
font_01_sfnt_off00010c92.bin
37017e1d3fe7aba41d853234ac4108a12285577af0488c2bb64dc20e869e3bef
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C92 16696 bytes
font_02_sfnt_off000137f5.bin
52f281c767db543b5833421963d72ca5ad0b0c78f4ba9348aecdf7a0fda57e64
pdf-font-stream PDF embedded font (sfnt) at offset 0x137F5 10196 bytes