Malicious PDF — malware analysis report

Static analysis result for SHA-256 218858e5bbb26bfb…

MALICIOUS

PDF

76.6 KB Created: 2021-09-28 23:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfe73377856c97c20dc2a4530b51a8b7 SHA-1: be1a19f160354058ea834d35013577abb1e4ff51 SHA-256: 218858e5bbb26bfbcabee1bdc1e2047e3c8dcce31d476debdc8c89cac1529495
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://mdbim.pl/ubezpiecz/obrazy/file/losugimoduzaputirobunir.pdf
    • https://gtnet-engine.com/ckfinder/userfiles/files/44272034793.pdf
    • http://teenmag.cz/userfiles/file/70072869010.pdf
    • http://gtlmarinefuel.com/userfiles/file/neforakivejetoj.pdf
    • https://hr-serdahel.hu/images/file/kedurutatobunuvujuzowupog.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/869b209c7e2de26d49935e0f61e82ab0/5435487036.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148adf33b82f---45925025488.pdf
    • https://elpollopaulino.com/cenavarra_userfiles/files/5496175319.pdf
    • http://skrn.cz/pic/file/xovurus.pdf
    • https://ibrahimkoc.com/images/Media/files/18876645500.pdf
    • https://coopinproject.eu/ckfinder/userfiles/files/42566819359.pdf
    • https://thuaphatlaihanoi.net/uploads/files/gazurefag.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/xalud.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475616c78ba---93402802267.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/12495487664.pdf
    • https://insinkerator.us/images/uploaded/file/11110171769.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137278331b55---koxetasefedapugavuni.pdf
    • https://ghnservizi.com/file/pudibexejonifezudus.pdf
    • https://emartdeko.pl/galeria/file/55329128227.pdf
    • http://kepco-group.com/uploaded_files/userfiles/files/82596566148.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/31997078916.pdf
    • https://aokman-drive.com/d/files/buxabodov.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f28ddce27---pilif.pdf
    • https://auditorescr.com/ckfinder/userfiles/files/87505634796.pdf
    • http://ykzn8.com/upfiles/editor/files/rakotepiminivodulivo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=bin+to+hex+file+converter+online
    • 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_off0000c138.bin
1d0951e7ecb2c401228f6c9c5c473af54e0bb8de56efcfa6c5cc221ac4955ff0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC138 19700 bytes
font_01_sfnt_off0000f4e3.bin
329f15e08e022b5f22fb0b49779addc243065fef84880ce999443c529efaa68a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 10324 bytes
font_02_sfnt_off00010c1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 16792 bytes