Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7f51b74913fc8d…

MALICIOUS

PDF

93.6 KB Created: 2021-07-05 10:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7c149bb0eac9f4d15870e560b7c727e SHA-1: 8f620fa8dfaf2683b5964f01878017fde81ebbb5 SHA-256: 8c7f51b74913fc8d60bfcee29c4c38a952bb159aee7134e10f4c88ccd11b767f
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains a link farm with multiple URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The presence of these links indicates an effort to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d43e293072---5507096227.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaaaaa86d5---xobumizukokenuvuwu.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/gataxexeturibumow.pdf
    • http://wumag.pl/userfiles/file/kovejik.pdf
    • http://stasta.com/userfiles/file/34990240571.pdf
    • http://antoniolescio.net/userfiles/files/47769017645.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/93c2048fec49af426ee433ae27637190/togezanejaravumezimuv.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/bitizamepiwuxa.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2de10b60c---zanijikax.pdf
    • http://duda-tech.pl/dudatech/upload/file/makuwirasodo.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/gm3eroai6cm533frvc5fpj7i76/diridodovalagupiduf.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/99ae0b074d5b3e79e75643e0391364f5/laletuxe.pdf
    • https://clinicaveterinariacabianca.it/file/tiboru.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/5089476148.pdf
    • http://heldermusic.nl/ckfinder/userfiles/files/novezapalalanew.pdf
    • https://deesudcoolingtower.com/userfiles/file/lekigimuta.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc827b7b446010360fa3ee363809b5ef/11391731053.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/858405617ffd2c6860ca6924085de4a9/89203768736.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/132b7612543bd4d6c5651afcf43eab98/bekoxenovobujapakamuxuf.pdf
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/suraneg.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16251269854952.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/fqa1t38c1o4a3h16i7tufn4ga3/42119830490.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc4ea1714---kewavebejexuseduzaxuji.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a7a7d516c69e8a71ccdc6130a3dfedbe/gotupirewelida.pdf
    • http://ash-graphy.com/userfiles/file/11740855282.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=reading+notes+21+history+alive+answers
    • 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_off00010ade.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 16792 bytes
font_01_sfnt_off000122f5.bin
52f0201a8325a09089a14a638b2d2ce20bae81cfec84743e02888521cc7b07ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x122F5 11012 bytes
font_02_sfnt_off00013c6b.bin
3a7927933aed5ca78e6d355b32617ce2b75030c0091ff752507e82fcbc1e6910
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6B 17184 bytes