Malicious PDF — malware analysis report

Static analysis result for SHA-256 1500869d349333c6…

MALICIOUS

PDF

73.5 KB Created: 2021-07-02 17:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 338f3cceac98277b67352c7e9e5408ed SHA-1: c94637ecd1245e2c467ca29d6a751fbd06c538af SHA-256: 1500869d349333c6eff64241a3ac9c008aa7674c7a7418dec2504fc0b1d4459d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://absolutelyneon.com/userfiles/file/63761716541.pdf In PDF document text
    • https://uleshuzataruhaz.hu/files/file/1106033338.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/31532005128.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/47341936491.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/fupezexomidutedug.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/wivubokibilibeniside.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/564f5b90e7b20c63aa673ddb5c8a6c48/jevotide.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa501441f52---59505845351.pdfIn PDF document text
    • http://web300k.com/upload/ck/files/zorojuginera.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105081747.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df7d515c13---21327006096.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/9dlfskgkkprt5clapj1s5cdgs2/tivopokukojabuluxe.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/nolewowilowomuvogamib.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160792f32a43e7---29511376593.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b655775b57---pipegini.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0335b27dfe3f76aa60c6c54e2e9127d6/gelaxanezutit.pdfIn PDF document text
    • https://medtek.vn/storage/file/jizafavelowadunasowazog.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/57087441832.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/8e87c70917b2543765af0c170b2d4c4e/bomiwu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a33d2a0ce6b---sajozezalo.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/medov.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210617_E2B7A37C2E5ECEB5.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/a433b3fb335c529eeadb3a03d1c67fa0/7762870918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=quotes+about+being+wellPDF 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_off0000bd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD569 10568 bytes
SHA-256: 3cd480aad4c977939d992d16544dd6354e7a491911e5ebe3839a45c016ca9d86
font_02_sfnt_off0000edd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD0 16892 bytes
SHA-256: 807aaaa843703c865d7e993afe45d4b3a19c3c339047ba19e34ad2c645aabafa