Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d9cdfa259ea6d0…

MALICIOUS

PDF

84.4 KB Created: 2021-07-09 14:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32b32b002956ea7678843766d75726ea SHA-1: 1af6d1e100908c3f2965532a75516ff703c0e8d4 SHA-256: 91d9cdfa259ea6d020b2eb8cde8b01b5cd73709cf8ab5a5f778309109d72701c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/2c9aa6e8cc016201c11dff541de2e7d0/gojupuvub.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/j53qhg22r26vh8jjv6q9fk0obe/48514368264.pdf
    • http://midel.me/userfiles/file/48101481706.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/76d57d3b45f55f5d73f208c95b3e1888/bobemijekekefotatuviv.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26932201046.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1e567341edbf79ead6fbaa36549ecc72/44376946518.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/27188c584abcc1699fa3150407db2023/tisojopu.pdf
    • http://gtshotel.it/images/file/34072463376.pdf
    • http://airsoft1.ro/files/file/58447692723.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b0c38d821---dunane.pdf
    • https://ewt.cz/res/file/92993856392.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d9f03153d---gupejodewegenuxolijevoxew.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/4067754f98c867929cc289a67ac1c480/90497834253.pdf
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/f2d3c5b150f39b694c69b9a6e2a0d395/25729790172.pdf
    • http://beateromer.com/bilder/file/17933576108.pdf
    • http://dailitara.lt/bites/uploads/file/jesepozuberup.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/12622841961.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c47adb1f7fc---faborofinimikebowipuvip.pdf
    • https://airflow-skateboards.com/upload/file/zuxasetilowoberedesezavo.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160e05bbe628bf---50510942734.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16075d07acddad---kulazuwubilikaz.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8a3550cfef606d999d53e4a3a368c7df/widawono.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/0ed4960cd6fba96a05472243a8e662a4/11331964142.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/9evhm4nfl4b6s5qc8htvhbbmks/79798891705.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=strep+throat+came+back+after+finishing+antibiotics
    • 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_off0000e6b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B8 16792 bytes
font_01_sfnt_off0000fecf.bin
afb2cdb4e09cf57df807db9d19161d7efc24755dfa243d242719f8008095753f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 11188 bytes
font_02_sfnt_off00011894.bin
bf81bac478088ef61dcb9119d8937ff6ed31450e46b20bc84f49adf62b14c227
pdf-font-stream PDF embedded font (sfnt) at offset 0x11894 16536 bytes