Malicious PDF — malware analysis report

Static analysis result for SHA-256 a511396ff84b9e46…

MALICIOUS

PDF

78.0 KB Created: 2021-07-30 01:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9dad511360775441a48eabbd6e64ab82 SHA-1: b9521d3721be25beade859018566a1ceb53d5adf SHA-256: a511396ff84b9e46d3e80bf84ce6362848808f964ed2e58054df3b3ab80694db
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8831

Heuristics 5

  • 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
  • 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://chalappuram.com/userfiles/file/mitenede.pdf In PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/jikofowidugewiritimo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mp1kh21qikfrome6si71948cn5/lupekijewisabunoxuxunilin.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16086566b6900a---jegibepu.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/63990994413.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d27600259e---90296224030.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb9b3bb7f4---16578325333.pdfIn PDF document text
    • http://hasyo.net/files/file/pesotikedusewip.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e139069ff6595c23ca08e42e31374adc/jadofawugij.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/kuwirekunidisijinuxunu.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/5roght0buh3c02o10trb9dmgdi/sulisakufisogonoweju.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/55495772677.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/5vigviuh4353ismqg0k95ehmhn/bibij.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3845969129---72186961829.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/f288341032417f35c26d9222e97aebec/33979887079.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083fa3b2e739---lajabetuzufoxugosavebof.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e20b8ccddf---10787940632.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/30642093801.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/4ad92f6a6e9abba514682ae14d7628b9/puxipejifoxan.pdfIn PDF document text
    • http://abnicum.com/files/file/31611962120.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/fd0809618f3ffaa4b486a053c910f861/25449084852.pdfIn PDF document text
    • https://dacola.com/upload/files/pirozofudasevavonizutaned.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4c8cca28b---1799473391.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2033a7a5a---86076482975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ecuaciones+diferenciales+homog%C3%A9neas+ejercicios+resueltosPDF link annotation
    • 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_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001043a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043A 11288 bytes
SHA-256: 6afda9f642a1a9ab7eedc853478a072992aa948e554ea76790039203718f31c7
font_02_sfnt_off00011df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF9 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c