Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d9254f8818bc30…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 05:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7a56529c385ad3345282b60ed2ca1ef SHA-1: 3623e3c1fe6d4ddaff7003a77fe9b23924888ac3 SHA-256: 41d9254f8818bc3003c1d4aad4b5e3ff95113aa77bc93755174e3c079f062239
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also acts as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. These URLs are likely used to deliver further malicious content or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://smidgel.ru/uplcv?utm_term=the+demon+king+pdf PDF link annotation
    • https://psfund.org/public/uploads/files/cms_files/mogunigine.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8eb3d71760714b53ecdd3e0493fca527/83188010063.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/81415062092.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/94926346612.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/3f1ecb555374c4b27437be2efa0d58f6/zeseteto.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/44309519726.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/73453220400.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/8517426556.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/zazegipilepat.pdfIn PDF document text
    • http://getdol.com/page_data/file/35085386637.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/14080788423.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/25237324936.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/16866063029.pdfIn PDF document text
    • http://baoveantam.org/upload/files/69363057817.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/xanobeb.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/monutitutad.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/67121254580.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/49663187219.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47ab43956---zizomisiwofapov.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d854e9cb7abbb7feaaf6ee1d250f0e3a/wotumasapisilubapif.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/tabibizevizelerawugozigeb.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/43993270530.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_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 17588 bytes
SHA-256: 516c326eb0dd497d1b3190a6d65036d4e7c304aa94658ba0bbd3e633bbaf9282
font_01_sfnt_off000110e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 10428 bytes
SHA-256: 80e92624e353e4f3fc7793805715efcb31e2ffb89f2e3441fd320c4b3afce88d