Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fc6c5db9801b69…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 21:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9848cf83e73452355549b351c4830787 SHA-1: 4ac5b584e1cc70a965b5f9d45042e3031e74bbe0 SHA-256: 12fc6c5db9801b69c51e375102e04899c4bb8e0d72d2b3fab2e443a0c54bd64d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack or a phishing campaign designed to lead users to malicious content. The presence of multiple compromised CMS upload links indicates a pattern of exploiting vulnerable web servers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2bf4d4a4ae713b5a59a2d9cdf79edfd9/82229451318.pdf In PDF document text
    • https://contabil-fiscal.ro/mm/file/muxokekuwijiw.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/t29sksgnkvmbgpq4vu71uq25eq/nasogowit.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/62685398074.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/boobsn37a9rao141ebfpdp1en1/gatorodarojubujazaludogo.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/felitogitojikim.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/rugefak.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/08bff15672c91a5017d41f00b957c539/84892914025.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/lupuginaputibupigija.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/2d26c2ec804e5216f1b8d40a3fb51905/juxus.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/15081439442.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098e00d953c4---12296684284.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1337a83297fe78d8851b2b164d87fee0/muxifawefijeji.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c861dbb4f87---60219668164.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f7f738a8b---83356784419.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/130562d723ee2d20fa846f90b95a8f70/vomelotigosefojiw.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16094041881153---23109541835.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/jabusodetaz.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb9a14e77---70017130994.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/u9umrjhobslq2fmus7ukavlg13/fawijevutilezuroz.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/popizizorafufuvopifenut.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/naxamowalelefebadaji.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/retibosanivekekot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=exercises+verb+to+be+beginners+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_off0000dc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 17776 bytes
SHA-256: ee52cb96082e1443041f6932210df4ec349168502b41213f3130a549ca8476c7
font_01_sfnt_off000109bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 10880 bytes
SHA-256: d5a08c3998d7078c16daff5203da9b8ddeb69341ef815598f9908076e6e0e2b7
font_02_sfnt_off000122aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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