Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb4d01883c6ed1d…

MALICIOUS

PDF

73.4 KB Created: 2021-09-26 02:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ba321782bdf6248f97ac4e3d5af134b0 SHA-1: 510d2e9073249a6b55f6d164ddff406a52bea93e SHA-256: 6bb4d01883c6ed1d7c067c00e48b96c79cb2d3e3e2bb5f322231fbe0f09debdd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser, likely to facilitate further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alhambra.kopanramen.com/uploads/files/bakaminoxubawiviwasenevur.pdf In PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134fccfdc9db---xojilukunisa.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/76650345447.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202191_231115_933.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad24060fd9---lokepizurelajufoxivi.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/zanotubuxa.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/8758918234.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/tivokaxum.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/jozip.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1083377863613cddcdb49dd.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/99222905016.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/47689427223.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/95013285048.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/94734269346.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/14488411782.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/mudukavev.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/zogegurof.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/xagotirodorovekawas.pdfIn PDF document text
    • http://sous-mama.org/userfiles/file/83458753885.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/jawisoxewevebudalugifatix.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/90313324484.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/sokukavabizivukojobox.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/dalomogifulapo.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/d48307b74f29fe77181fcb6ad053b532/boretidewutoluk.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/mobidomowatige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=update+miui+redmi+note+8+proPDF 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_off0000b796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA8 18744 bytes
SHA-256: b8fa74a67c0511b58a128b96535a61f8454c7c130a6202a2a40868a74b1f8ef0
font_02_sfnt_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 10652 bytes
SHA-256: b4019d31dd4cac8c7381d57e81e11b578c30cdc37a91c331cc38a89bec00970b

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