Malicious PDF — malware analysis report

Static analysis result for SHA-256 1236344277878b92…

MALICIOUS

PDF

82.6 KB Created: 2021-10-04 20:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e9f0d8461c492a24db86696dcfe4e64e SHA-1: 6db8b7dc22dd973ed4025eb0a2e5c162532f76dc SHA-256: 1236344277878b92ef896d6e4dd6ef09038b9cfbf83557f429dc660a8a030774
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple unknown URLs suggests a broad campaign to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://clubon.top/uploads/files/limokaxejora.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/a5404181bde5baadde82af8477354f8f/zatepivako.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/vakunizitaweji.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/debanem.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/67178041835.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/ziwabawe.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/9364913445.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/riwafopuf.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/madodarojonunizuwadomov.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/kopewatozeziwabekas.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109300817562942.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/kejetojowegitu.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210908_134818.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/65393909798.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210903142145.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615715b27c551---29398336246.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/78229387203.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/jivibifosa.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/26557177201.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/91846942510.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/jiwexefofosivulotavug.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/82576420092.pdfIn PDF document text
    • http://camonetinternational.com/files/file/43888475824.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613beb99bbb52---81443462968.pdfIn PDF document text
    • http://ruihuitax.com/files/file/movubiv.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/nogawuwupugadazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=print+to+pdf+from+iePDF 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_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 10284 bytes
SHA-256: 5a3aabc92457eae94a2b065b35ab6c22bfc4a800102dae4ee3e51cf0a016c80a
font_02_sfnt_off00010fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD6 17200 bytes
SHA-256: 7a0e5e6e94760f0b8c9ad750b60341273c1dc629da4a2b04a642935960306f33