Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0dd6a18c7cd1943…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 00:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7165086e10cba893b0935f1dc8f7f5c0 SHA-1: f384aa95cf8113c074e3bc95eaf1b2c4252e5c2d SHA-256: d0dd6a18c7cd19435ed8c110932f6be8238d3f7a75ca08836b9279fe38d82a99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to a link farm of malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=dgamer+hack+mod+apk+unlimited+coins+download PDF link annotation
    • http://www.bash.cl/media/file/gofasanozonodukusulo.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/16819926991.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/sbem66du6gi99vv02ohr9956si/30588639455.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/be1c7e6f29132750ffd0b9ab5fc232bf/zenilopemorarodinoze.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/42450169725.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/kiposutozivu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130222484290---2788583248.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/femapabiwubalu.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/88993669064.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f5a9f651f8e3f80b905569abf255733d/71061003244.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/73031500666.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/rowikikusin.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/nazekafuviruwizuxetixaram.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/24216969658.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/nevakidugidu.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/saguxinibemuxa.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc02f0461b---koxiti.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/josaxemininaj.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/vinopinure.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/pezimafazinoko.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210913_0680BAC06EEBBE9B.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/loroxixudurorasusapomotev.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1614c609e4cff1---7295832429.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_off0000ae18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE18 11240 bytes
SHA-256: 37ecf065c86eb06667bc7223589bb8d033e4a58b4535ce43a44346f1cf2f8ad9
font_01_sfnt_off0000c81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 14520 bytes
SHA-256: 56e89288b32cb604b9ab2e09e2ab986e494631bbd99468981fbb38f7b0844805

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