Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a99f76bd5a9b744…

MALICIOUS

PDF

75.2 KB Created: 2021-09-07 03:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f16c1ffb59bf5bd144a6dfa407845acf SHA-1: 842b6cefcb77ad3eb58cf9d72954e56fcc190935 SHA-256: 0a99f76bd5a9b74460db90acec7f230413f216d000cc098778c866366174971a
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many of which point to compromised WordPress uploads or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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 http://codienlanhminhquang.com/upload/files/kenesekabofusolijoz.pdf In PDF document text
    • http://americasbestmanassas.com/uploads/files/bepobedofaf.pdfIn PDF document text
    • https://projetovm.com/uploads/files/76623349804.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/dowuzabozuborubopixepimid.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160712e8e643cc---dedem.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/fejuzolugofazepepudab.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/86590651144.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/vaxivifawabisigud.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/10443190068.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/bobimekadow.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/dj5celk4pjrd1fknlhqp1begl7/76185939257.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161115561127b8---89317375085.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/55309774258.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/766362ccc8a6574febd0d4d04b873f19/51406107943.pdfIn PDF document text
    • https://globalquestconsulting.com/userfiles/files/jufeb.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/dopexepevas.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/51910223676.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f17a7be513---taforenetudatimeviwurorok.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/2ad97fcf060e5ef1c2d8ba803449847e/45096359982.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aef80a5164---zakoxojaf.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/januvovibudik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=videocon+d2h+packages+channel+list+with+price+pdfPDF link annotation
    • 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_off0000c0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B1 11164 bytes
SHA-256: 6a0fd60e6d46fe8e8f10ce16d707860a327ebc09abd2a122f473221c580e6b12
font_01_sfnt_off0000daa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA0 17120 bytes
SHA-256: 15702ea2be0c3cecfa6123bbf16fe16e5540a8a9ff0bd0d2a81cb32538a216d2
font_02_sfnt_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1