Malicious PDF — malware analysis report

Static analysis result for SHA-256 f680b83b2a28d989…

MALICIOUS

PDF

73.2 KB Created: 2021-07-29 17:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f63b1e3d32983d466f5499f2528da0e SHA-1: 447656f5152b36761103390164e11c4bd9594fba SHA-256: f680b83b2a28d989ca9582824d2a7e14a969869cd55cce7ce6ccc867065964e7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution document. The presence of numerous links pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to redirect users to malicious content. No scripts were extracted, but the document's structure and URL patterns are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://intervalhousehamilton.org/ckfinder/userfiles/files/juzexewero.pdf In PDF document text
    • http://easyreturn.store/userfiles/file/33370709696.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/59014415604.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba467188924---tugipesawo.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9sahkj1fvtki5man19fg86jrme/59554092401.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9bc248f4---10434945401.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca4b81443---57832369709.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b4c1cbb9c---gexanazixotabam.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/bejiregijeb.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b12ca5adde6---gulir.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210529142704_8dk0vz.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/jbrtapujg4gqpo332c8qs96vft/49256310001.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/birupifunolopidugagew.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e228462251ea44bfb82168f98a201035/67986037809.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d1393786---gomigiselupofesamib.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/19023877239.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/vvgtld8a7o4n0d419se8am3sok/96301981357.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/titiziwebejuwupaxazu.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/4c2f96f31d0734f245c9e60e3bb97421/lizewekoxezenufunepuso.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095acf8a5e08.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/66420286378.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44bc9371ba---tawixoxafin.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/xikizetireleviwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=divisores+de+1287PDF 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_off0000bd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0B 16288 bytes
SHA-256: de3b6f8241246407ce6bc6859671057de1d9d3b7a690b965244889462b0b0864
font_01_sfnt_off0000e693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 10328 bytes
SHA-256: 6a6ca9a2f11b7531162af45bab9ae66512f7a01b8ec60588c89468b264ce2b5f
font_02_sfnt_off0000fe23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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