Malicious PDF — malware analysis report

Static analysis result for SHA-256 908cccb93f8d047d…

MALICIOUS

PDF

73.4 KB Created: 2021-09-18 06:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e019fa95b2ceac358c130e7121be7c59 SHA-1: 85b3c0fb541ae3d0c0bf288fcfb557c16850c16f SHA-256: 908cccb93f8d047d7d99e7e0f0001fe791b002f69963581a1a687feb5769aa8b
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many pointing to compromised CMS uploads and link farms, indicates a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3647

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.
  • 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
  • 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://pixomot.ru/uplcv?utm_term=how+to+hard+reset+android+phone+using+computer PDF link annotation
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b55c459124---gumiwoxujagoforiwuna.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/mowon.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161330db95d848---27036068383.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/kurixedax.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439c7837964---65845338810.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/pumel.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/2apa986leit9ub3cl6gc55f812/61433809261.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/19785477683.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/laparexaza.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/26074110404.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/wetaguvorufuposokovedu.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/ravalikifuxomakemapob.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/miloperixiduvojot.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161390f7465de3---73259821120.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/60161412923.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109051648041454.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/39000762007.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/lesusi.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/wakabebanapesabipo.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/47107752.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc3c84d827---42923494063.pdfIn PDF document text
    • http://haphadoor.com/upload/files/rudusukedoxavalusoko.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/39097671652.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631514097.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/jefamotuxunaz.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/69766120365.pdfIn PDF document text
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/rejasojibogafoja.pdfIn 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_off0000c9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C7 11092 bytes
SHA-256: 65c853be155d6ac4bfbbd2c999fef0e6be0dfe0baee224ed2afc3c45881969fc
font_01_sfnt_off0000e345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 18148 bytes
SHA-256: a9a7e096bd0b30c4fe41696637cdcaf1d39256238ea6af2018180437b07cc407
font_02_sfnt_off000111fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1