Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a79e57b61ad0753…

MALICIOUS

PDF

92.5 KB Created: 2021-09-01 18:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b9bb4bfcc6c372c4b80ca716002f8ebf SHA-1: cf516bb769b1dc3a346253c43d04d132a461d9ca SHA-256: 8a79e57b61ad07534f6139520de25e622b5f890760bf7ba85c00b6c784afd5d5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting an attempt to distribute malware or engage in phishing. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential SEO manipulation or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e96e7cc73---47436332087.pdf In PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/972cc8a9000c2404137c48d9ae2c4a55/90931401737.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/3d35c000af4e692ca55e6e12feeca5c5/49806240177.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/96889852696.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0eb80f25d5359e60785ce1e17fa8c48c/42825676410.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/17147134584.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/37163451296.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/75890363532.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7e25d5734---43806264692.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062812533230.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/396e63fb55859c756ec9e237a94ce5da/bedetadizij.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/pobudeb.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/akjbnhe3u3aftcj14uiquobn19/fesoxifixibitaseguzezeno.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160707b194145b---luwepebazirufulan.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/dewutegavatokovetuna.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/dc304de1d014569620dd2f87f4cc04dd/vigexupofazi.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/91200246146.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/13703758992.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a564af67878c85b48b7e1eeb12ce17c1/37255344811.pdfIn PDF document text
    • http://all-premium.com/user_file/files/76179822016.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/75127920141.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/kokoxekenalip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cefb4c0986---zifutowarufu.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/93014ee6d783d688e7e4d40d4dcc6f87/teropuzalup.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/fbcbb2e6eb22d01f5d5274a1e01c59e6/kiponagudasaronowetul.pdfIn PDF document text
    • https://mytopics.it/uploads/file/damajitagoviki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=tympanomastoidectomy+with+ossicular+reconstructionPDF 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_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 11044 bytes
SHA-256: b3337c0f4dc1c4e6ae14115b179bdf28fbe4e811ee997fdc71580e6b744ff6da
font_01_sfnt_off00011913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11913 19476 bytes
SHA-256: 04492e495ef1a54dde949a923a92f491fc784169417b31cb85b1f721450be073
font_02_sfnt_off00014c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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