Malicious PDF — malware analysis report

Static analysis result for SHA-256 f451c9380116b0db…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 09:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fe5ccd98350a45fb4dd7983e93d1f464 SHA-1: 7678a62afe10b0b5026319ae5845265163037bc3 SHA-256: f451c9380116b0db4a9d1190102e30ef35dfda78be66f32702badbe2b335b760
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous compromised or disposable domains, likely for phishing or malware distribution. The presence of external URI links and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://areicon.com/images/file/jidinizidoxowagata.pdf In PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ctcjlf5tqocnjph08ogn1gn85c/sunarekewamazoxuxugedog.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/sipaj.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108d2e6cc2fb---tunufapebanujebonexuzi.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/67573153093.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/kogeluzitutisakufaso.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0de42c9b37---64228023345.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/628556535.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077185327baa---toxoxik.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/golabi.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/wawokan.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/heag5d2sq6gn0jl58orotn58e3/jufawafonikawariki.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3f0d1e63531b7b89d062ecd3b48575c3/vuvuzesovibizogumerij.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5952fd78fc---42098206115.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/90177705205.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf18cb663---3405094489.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/49367118950.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/vefisinimumemaxeru.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afb192bdcf4---44528238544.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///32382639392.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/1e7cd638c518827e2b72c7733aa9293d/refigarax.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/zemilu.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/9rva0ulmlkun9k6mpv383ijjg6/kanukixim.pdfIn PDF document text
    • http://sns.hu/_user/file/lofuxenarupigigudineziwob.pdfIn PDF document text
    • http://jucal.es/images/file/26570808362.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/27159022346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=asciidoc+pdf+page+breakPDF 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_off0000d2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 17096 bytes
SHA-256: 454a5c36c8e4a2d698a9d31b9d84e5bf4035772f2895367c1a8df873a12adae9
font_01_sfnt_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 10760 bytes
SHA-256: 283ffa1d2291c4806ed80a3fbfe54f67f06fb405d06902819dfa74b50c18beb0
font_02_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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