Malicious PDF — malware analysis report

Static analysis result for SHA-256 90291254372631c8…

MALICIOUS

PDF

67.6 KB Created: 2021-09-19 09:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 768dfa763b94423ea29250fff00374e1 SHA-1: 5b1ba6b3df5d4794b34065b5ffce39ae06647694 SHA-256: 90291254372631c841f6314bfc5922189cd9b991b4e00efe337e3e04cb01f8e5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://archism.ru/uplcv?utm_term=how+to+download+videoleap+on+android
    • http://reckdance.pl/userfiles/file/galixelebojaneronetam.pdf
    • http://ieeepes-thailand.org/app/webroot/files/files/73328200228.pdf
    • http://koutingchina.com/upload/files/59684631663.pdf
    • http://bftt.marketsearching.com/upload/files/22067959408.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/rnjkvkdml52bl9ki1l7lqk5ug1/22549820892.pdf
    • https://ckmusicdesign.nl/userfiles/file/funikidox.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133bef6b89d7---66202315811.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c62341a0e5---ropawigulegoferobegikozuv.pdf
    • https://signos.larrialdiak.es/files/galeria/files/karusatakobum.pdf
    • http://rucodelniza.ru/userfiles/file/munobelubefetiwisabobuti.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f176d3700---24215448999.pdf
    • http://synphabase.ch/upload/file/tufirawijajupatitogi.pdf
    • http://dobermanncz.eu/files/97438828830.pdf
    • https://basundharamart.com/userfiles/file/kitipokupipalegatome.pdf
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/85688558184.pdf
    • http://rafaelstore.ru/upload/files/koxoda.pdf
    • http://alianzablue.com/aym_image/files/19012529371.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415a9f0dba6---fumibunefisutitigofevide.pdf
    • http://alwaditrading.com/userfiles/files/zudaluwogesurodupe.pdf
    • https://mama-light.net/business_school/uploads/file/fejoza.pdf
    • https://gulceoyunlar.com/calisma2/files/uploads/katogimipadosowo.pdf
    • https://sharjahcements.com/images/bulk_images/files/jemoretutarusop.pdf
    • http://linhkienhunganh.vn/luutru/files/5333500931.pdf
    • 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_off0000adf8.bin
6f2769f0cf88ffa6c8ab7f95344732d2779036f613c7f93c4980098815c82457
pdf-font-stream PDF embedded font (sfnt) at offset 0xADF8 10360 bytes
font_01_sfnt_off0000c56d.bin
0cffc36c8c06b6e3ed4c565e65fa93f167c2546b1e8656f48b4fccebc954ffbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xC56D 14292 bytes
font_02_sfnt_off0000e8df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DF 16792 bytes