Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66ff242dcb1860b…

MALICIOUS

PDF

92.6 KB Created: 2021-09-06 12:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7876451d199467717181878e1ea79bd7 SHA-1: d728bfa3b5616866653ced94616ec30c999785a0 SHA-256: f66ff242dcb1860be8dc212b0ea4e4215cafa6869641c03f3cebb83ae8949ece
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://nickelsgrafikdesign.de/ckfinder/userfiles/files/purifubelatalej.pdf In PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/47661446879.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/43019458084.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/razexaradijut.pdfIn PDF document text
    • https://pindimana.in/uploads/file/bizugela.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/58412534989.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/lokazotogitamapugobuw.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/95543785302.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/62930002872.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/44512799844.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/31546122653.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///20217311737108999.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/luvorogi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085599a0a941---89254887158.pdfIn PDF document text
    • http://cpviettin.com/upload/files/4993804808.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e3013e217---jazopejima.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/2d74no4hp3hmc806v92qdtup4a/dalusisijegirufogazuja.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/24475265466.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/30310616336.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16079bd890b522---73271080085.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/70675651939.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/26276199583.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/8jj9e6qlupamlilpumkbb21uu1/sukire.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/79084324813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=uu+kpk+pdf+revisiPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/tagux.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_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 18208 bytes
SHA-256: 156741eaa763030449a923af3e6444a9e58daade515812de564635e13e06f86f
font_01_sfnt_off0001361b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E32 10224 bytes
SHA-256: 7931282145032efcc4c03d600972f1f663fcc88b66fab21a4cfcffaf109db9f3

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