Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cf7d354652817a…

MALICIOUS

PDF

89.4 KB Created: 2021-09-16 21:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 10618237df2642960206fa11e073ca3d SHA-1: 62e00bb8272077ff6edef622f46cbc9e8760f080 SHA-256: 37cf7d354652817aaac09a278a42a9fd8f3aeb107a143fe1fdadbbe9f8d04b2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://krisoc.ru/uplcv?utm_term=sin+city+graphic+novel+pdf PDF link annotation
    • http://nyett.hk/uploads/news/files/23664375490.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/jejuzejomuvubasenime.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/boboxesa.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/letelugozo.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/67831494968.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad7279e1d---57785699335.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/tigivofusafexe.pdfIn PDF document text
    • http://mp-journal.com/media/file/moloboj.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/s3nchbsv02emvu93738ro1vst9/98998289099.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd3eaa112e---zejexevofuwopuv.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/62799266765.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/768212e3e5ed347689fa9a03823d5fe8/mefuvugusutu.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/najizezaxilo.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/83267194955.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/zosigebuxagoxijabevarasew.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/tufususasevimo.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/pigijasab.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/45737547614.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/boloje.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/viserazisagarozeb.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/67621032429.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/desekalivas.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/nuwaganenurinipidejonewa.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/kenika.pdfIn PDF document text
    • 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_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 18456 bytes
SHA-256: 7c99d791bf10f5a9d5d8fbc88751fd48c757b67b47bf972f3df0d6ab1646d38b
font_01_sfnt_off000126af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC6 10984 bytes
SHA-256: 70ea68d16a86ebd061539207d7f6205a5b3dc1b3ff3a3745cd5ca8786c180ef3

Open this report in the interactive analyzer, or submit your own file for analysis.