Malicious PDF — malware analysis report

Static analysis result for SHA-256 51678de9076eaa62…

MALICIOUS

PDF

127.0 KB Created: 2021-09-02 20:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a679759dd7b30bc38042d2b267031d6 SHA-1: 12cf2bbee36f37880982a58fd1aff1b1136627cd SHA-256: 51678de9076eaa62dbab2877d6464696f38e1dfacec5d188dec66a18051881bc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and the presence of external links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/b0c019bfd42e6aaafb4ed28d11ed975f/76359486927.pdf In PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/40875844822.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52d6322251---64705508685.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/vejekojomavarem.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/38739713249.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/c9147a2ed2637722b41b4eaeeb64bc51/31204896102.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2313679d72---maluvapikoxuwogezav.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b976030f26e---19230120355.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ecdf45c87---2894723986.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/xulalididonezuxadani.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/20970424649.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/j8ga8o4d09dpffo51vf76jv2u9/39907155588.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/62934299312.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad784c394c---xudologax.pdfIn PDF document text
    • https://harom.ro/files/file/zerifeluzufeponelenenefob.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/42739276180.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e8c5a5ce---50570103347.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bb294a1c758---dimileweret.pdfIn PDF document text
    • http://calebdobe.com/clients/875189/File/xadumobobigoneg.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/1184649233.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/77347168106.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/62921414648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=vd+savarkar+hindutva+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_off000187d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187D2 20964 bytes
SHA-256: 9c146a92a73fbee31addb237287c17ebafabd4c30f0c59a3f9663c7230575450
font_01_sfnt_off0001be4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D664 10524 bytes
SHA-256: 2687fdeaa2b9e017b781aab849c159ee112f6f587831e2d4bf4be60fbee23696

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