Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93aeefffb41cd7f…

MALICIOUS

PDF

87.1 KB Created: 2021-08-05 01:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 0df1ed03de459e02d373d077e9aa7003 SHA-1: 5b43eab6ebfa7b6bcf117b92bc5ba0b518eb01d7 SHA-256: e93aeefffb41cd7fe98a07880b26f9c81019325ed117ca6f0457d24469ec239e
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=god+must+be+crazy+movie+download+in+telugu PDF link annotation
    • http://abwpetersburg.com/uploads/files/rebavamanafixuwas.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/34584043043.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e721e8116710815753b8e233c47b16f9/59042198829.pdfIn PDF document text
    • https://robertbah.si/files/file/dajitumegorabulogazi.pdfIn PDF document text
    • http://vce34.ru/attachments/file/78832357398.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f5994dded---74808551646.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/jg3akl2p5tempk8qg3gkp1gour/zibagetofi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lvgsl4pj6h1v6invtuqo8hqkii/56983510482.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2795817a16---dixatanunirimaxog.pdfIn PDF document text
    • https://davaocarrental.com/images/file/72180287077.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4f906aae4c5bc7392b41464f54a7c06a/guwibapovuxawulirulovis.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/42426529673.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/58410659150.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/musekemik.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/d9a15ku94a4iqrb3ulficvobe2/vador.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e512e48b543---sizexalenadapafiditalivi.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/peletojuti.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/47562961214.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/miteb.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/77846653427.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210718041647.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/ccaa61a9dc96a2e17fdc22eecb1946aa/42621639227.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e570e0680---93265908109.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 11320 bytes
SHA-256: 463542d8c03827b5ad9bb3f8f8a07453e4e492c3926fe22f6a0c63cbb8abf3d4
font_02_sfnt_off00012314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12314 16920 bytes
SHA-256: e38081e4a5a2d3524813d9ee211ee83d2bbcd021cc70b0367a7ad4e52d1efdbb