Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b73070eac6525a4…

MALICIOUS

PDF

72.9 KB Created: 2021-09-04 22:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3755cfb3b8d13875c34d834b2d33f68c SHA-1: 47a718b54af663970c90a553f1798f6a2e0c2e34 SHA-256: 2b73070eac6525a451eaadf432df1ed76a123fbbdda0ed05a7fed7b7745198b3
204 Risk Score

Malware Insights

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

This PDF file exhibits multiple indicators of malicious intent, including the presence of algorithmically generated URLs and links to compromised CMS upload storage, suggesting it's part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a lure to download a second-stage payload. The heuristic 'SE_DOWNLOAD_BUTTON' further indicates a deceptive user interface designed to trick users into initiating a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://europacreativaeuskadi.eu/files/galeria/files/90046219101.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608f90d8be91a---pewusakisutawor.pdf
    • http://trubaopt.ru/content/file/81988811950.pdf
    • https://lrsinc.co/userfiles/file/97714044467.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/3aad65409081c173a5a7cdd0590451a8/texaminazegede.pdf
    • http://phoiinnhiet.com/images/uploads/files/kekukisomijugif.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7b3dd8b1f8f3787cf1e43b77287941de/gegomufuxibojasasupegeja.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/9016aca61c4c0171a426e44ba75e3a98/gediwufixedutijidewo.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/66625893384.pdf
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/36479877034.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d72aae2ae2c---xokoziwezeforov.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160833c9758450---49241159444.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/25e36f6377f52ff6f32bdafcfba6f0ac/pisifudafetibepegudabujat.pdf
    • http://come2menorca.com/images/file/36361706767.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/sclneab2e2hul2fijaen7rhn7s/57258657978.pdf
    • http://myphamlulanjina.com/upload/files/donoxam.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161235a4dc1830---sufupofufog.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f3ce3836---28164551830.pdf
    • http://trustarshida.co/cache/fck_files/file/fogebobenabe.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a52abf8fe---xevowatexazal.pdf
    • http://mh-gartengestaltung.de/userfiles/file/54651707026.pdf
    • https://sharjahcements.com/images/bulk_images/files/nevegujafesil.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/u4ocmqmf7d9ftabj5jnaug3jbd/63054166938.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=manual+usuario+fiat+grande+punto+2007
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc97.bin
b4a58a65cb6527454ef5181d85bf8d41ef248c6b3cc18676739a87cedff6e9de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC97 15528 bytes
font_01_sfnt_off0000e41d.bin
a4b81f3503d89c20994fd497022a5459301ebad08504e9f31c5bedfc17a151f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 11060 bytes
font_02_sfnt_off0000fddc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDC 16792 bytes

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