Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b8404218f93e5e…

MALICIOUS

PDF

96.0 KB Created: 2021-07-26 12:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca536ebe10df043fe0cda8010fe33b64 SHA-1: 85eda7625cfa0bc88d7aa5f51887746e1f01f902 SHA-256: f3b8404218f93e5e236b05d0ad50eac5d4b245b4e41efc581c1922be7e51b699
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded URLs are consistent with a campaign to redirect users to malicious content hosted on compromised CMS platforms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8747

Heuristics 5

  • 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
  • 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://anhbanglaw.com/userfiles/file/jofugevulewubiwijemev.pdf In PDF document text
    • http://chhsclassof70.com/clients/1/1f/1f6d1b94cf555b90b9f410dfa82aea5f/File/22361748405.pdfIn PDF document text
    • https://nada70.org/userfiles/file/daxosaginugagijuzanamiz.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/i4edp18h2862f39dqee2bq1b17/38117399855.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1cdc82eb---dadagexudewivodu.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a70af132f36c0087d7971f9005da8a6d/tobumuzepikuvepiwupodu.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d3c79628a---39851001076.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/tevarowi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74c5e6c740---20582303326.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd57f9170a---kozijuwore.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/fagapug.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/suliwekaluxofirake.pdfIn PDF document text
    • http://darec.sk/files/files/pubaberi.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/38549615266.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/302f4962db24c74acfee370c86c2fbe3/23077649957.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210627051953_ivbgk7.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/gatedufijawi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b81e7fdf77d---73366790209.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/tafovemesojasugarevo.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/55280291803.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c9659deb2---zagepakokizurap.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/tasipasizipilapavowez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=antropologia+culturale+fabio+dei+pdf+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12292 20768 bytes
SHA-256: 5a2163a541f6974a817e54890b6cc399a53649e5919fb8edf9195cae14209ca3
font_01_sfnt_off000157c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C3 10932 bytes
SHA-256: f258f51d7d2bc726b589fdd52bbcd1637ce240cf7d802924004e0f61edeb3918

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