Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd99b7613af92b23…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 06:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb09a292e015da58ed0ed660a647d35d SHA-1: 211b697ec21df0308107346c62abcf42ec7fe475 SHA-256: fd99b7613af92b238c2bb3240c37e5cbb81b1c0a859f088c246d8c5906c122a1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. ClamAV detected this as a phishing trojan, and the ML classifier also flagged it as malicious. The primary function appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://guides2alpes.fr/uploads/file/mukobovinunum.pdf In PDF document text
    • https://sporyolu.com/resimler/files/97322318746.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/kozirikegegekugebuf.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/1292965892.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5b7df20102aa389cc39898034c90fc1d/pepirekitekuzefaxa.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/xadewepabamifanuxuru.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf54c9dbef9---68581051836.pdfIn PDF document text
    • https://questyme.com/userfiles/file/wikazebobok.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/80881277104.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/lomukimavamopapaja.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/39894588336.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819477c8939---69687317295.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/zuvumafikaxese.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/36736857597.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/49693fe0234334e628716aa7c7cab6de/83046208394.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f6a40a62b---fijeputoxexiworibosaxepam.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/gubemutudurizufexovevosa.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/2031220245.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/59705044342.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210904235830304525.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/so96afnfquljpvhq5c25c2ad07/vumebodixuwukupegupipe.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/lemabenulewetaxupali.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/42771393764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=human+development+index+2019+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_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 11112 bytes
SHA-256: a32f4f379b10db5f4953641cd44c18afdcd549b3e7f6cefdf9a31703d53ea95a
font_01_sfnt_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 17264 bytes
SHA-256: 0bec4e37868586214cc3a7ca4d6af8d5cecb8606b6324a19332ecad63aafc99a

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