Malicious PDF — malware analysis report

Static analysis result for SHA-256 4971f14bea33f73c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 01:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d61e6f976fbd382a27b0585972be2a1d SHA-1: 150369cdf0976afc74709c1ca20e0362f692e5b3 SHA-256: 4971f14bea33f73cc8fe94415f8a1f673b6f949f09b4f7af4fd7c855b9f28573
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malware. The structure suggests a link farm designed to obscure the final destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089633b5f90b---77055964453.pdf In PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/pokesagimonalivivugox.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2c1c4906d50d219073d0b16715903850/82957958747.pdfIn PDF document text
    • https://hobbypet.cz/files/file/geluvuxokowejinedizazuje.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b5de93f701ff558e07a3a8f8cb32baef/29489961213.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/40676615479.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/3ba2b768ee5b073c90ebc647906a53e5/nelitomadevadexekadela.pdfIn PDF document text
    • http://beta-rc.com/upload/files/majazanobofiw.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/25373335.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ph9gsilc6lr8kn0cikgcc21d2m/refado.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/7a79d8039c2df3d83ec8c57f480c5b7e/sapisoxexibeporigaf.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db7e62b7ce---vovubovudubidupafiv.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/94253190310.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/31759739663.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/bimevetezagex.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210805_4DAA48F56178461B.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7dfdb612b48dcc6122ed9ac572a2b58b/silinefevaxuxozowikogabi.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/vinoa05qnr3367m56apulad157/jikililarevez.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/31597991506.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/5432576753.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/31240752303.pdfIn PDF document text
    • https://synersys.fr/contenu/file/75897445385.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/939f375313d056e4408f6ea4cb769423/77659780735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=fountain+meaning+in+englishPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/02e72b55f82190f51c3dd71527e6228a/jutagilaf.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4d69fe53f22805b89854246a90275b02/47092547583.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC381 16368 bytes
SHA-256: b208a33b27b8c0ed1d8a30f270b7cff2021028777a5c2006fe3087b5990b0983
font_01_sfnt_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 21720 bytes
SHA-256: 1cf5af6d6b5cdd6cd46b8f78d35019d75defd30adfcce354a1ea9ef56b79baf2
font_02_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001299e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299E 10532 bytes
SHA-256: feaba91930b0423d99007f797a04d593048681984a418fad347a332ad69d4d0d