Malicious PDF — malware analysis report

Static analysis result for SHA-256 36158cdbacbf3063…

MALICIOUS

PDF

94.8 KB Created: 2021-08-16 07:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d59833fed5218074807cc0f0c0b9f0e3 SHA-1: 0d842ddd51f7833520a47ad5d1953462b511e4e5 SHA-256: 36158cdbacbf30638e113c22fc32a463998fca2c1e5f94759715889e3556071e
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious. 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 attempt to trick users into downloading further malicious content or visiting deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://esenkardeslerinsaat.com/resimlerfiles/32178919138.pdf In PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c89343c354320be2877b5f2e057caf0f/2314923708.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/9glr4af0j92vdujpnk0oce61fv/jifagazetojaxarorinej.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/faruji.pdfIn PDF document text
    • http://aven.su/userfiles/file/92276800995.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/g74rh5atrgtk8bpbpma5ndut4q/futegenixujig.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/0sc7a806sfomk27cmo7u9d3njq/pugug.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe4561b49e---74439039874.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b41874148---mekivafevi.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/97328901446.pdfIn PDF document text
    • https://ptogel2.com/contents//files/93810426359.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/01620511dd1b2f1e3ba5c40c4275f584/gadusitid.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/wipezi.pdfIn PDF document text
    • http://nakatka.com/files/file/dexoguwewuroka.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/54520405810.pdfIn PDF document text
    • http://geotersrl.it/file/bozizanu.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c64235a4a0f---62960236554.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/4rej9d10m2n06972c0dgvjhj8c/80149818676.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9a5a95633---mimer.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b724f5ab80---21104691570.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b84d3fc6f---zufenexedifikunivujuwax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=reteje+de+maestro+masonPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 18136 bytes
SHA-256: f7ae7e4019381995609ca7d2dd40d7c96f8b69766431ee6cebc927688298088e
font_01_sfnt_off00012572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D83 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_03_sfnt_off000152b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B9 10444 bytes
SHA-256: 36e4c05610dfaf4cab2c7431b58fc6bf503ce40870ab1ab1f7a0655cee9a8d82

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