Malicious PDF — malware analysis report

Static analysis result for SHA-256 461cc6e09b043f31…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 05:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 176109a27c430eab861e88c0a96a9099 SHA-1: 8fc907479b3169df14c834233f73db1ee8a73dfb SHA-256: 461cc6e09b043f31ab715c1f80348d54e640b876557ad3aac1295e6d6b8ca746
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. 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 presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://fixafilm.se/userfiles/file/tisawakabanitufasunalufa.pdf In PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/38551857162.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/puwowigodijekifaseneb.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/42064207030.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede102ede4---lugofagikulideliriwosiriz.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6211bed502---62631578760.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607424e80314e---88342994188.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/nkq2i9a8pj3r59gqn3mmnhr8j3/kuzovogudi.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/xiwejexike.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2890031468---xalekoreluwuve.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/adst48mvaq9998lsbperu8t342/fosununipibobijivekig.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/8118324741.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/dinusuvaderenutebabet.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/8976830248.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c9e476211ecbdfb656d9e4ca2b300b26/44407512404.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/jibabuwipoxukivo.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/90346254229.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/mitaku.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/89330118486.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/rolegejolusubofewo.pdfIn PDF document text
    • http://utopbrake.com/uploadfile/files/27244349371.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a612fdf7---38463475839.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/n4050vdnevcjacoj8me0cb2og5/93102579178.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/dejalegisetutawedupafer.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/26652915336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=spin+and+win+iphone+11+pro+max+2020PDF 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_off0000d4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 19628 bytes
SHA-256: c45a0b6e4d9c87f383226a7af1e1fa9a592605d7fbe041dabfaf6122d9e0d576
font_02_sfnt_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 10904 bytes
SHA-256: 27b65604cb9b44a5d412e30d375a072d4579980285b68b93cac3ca4350c8afbf

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