Malicious PDF — malware analysis report

Static analysis result for SHA-256 37602239b0b097ac…

MALICIOUS

PDF

89.5 KB Created: 2021-07-04 21:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 257cc3dc35f8b85db75a0bdce3e4549a SHA-1: 6138fdde0126b23be088fa112bfd2605d7add23f SHA-256: 37602239b0b097ac574c75b4d20ec3f585c432dbe51deeb5ae4e440e98429d4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting, likely to redirect users to malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users into clicking through to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/f69312c4c8babdd0db05ee6295ade321/zasatalijotuxul.pdf
    • http://fdscience.com/UPFILE/userfiles/files/gikaxapafexawipokupijal.pdf
    • http://centurionim.com/userfile/batiment/file/43064641316.pdf
    • http://studiomanzella.com/userfiles/files/jixesebikusaxorof.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/sk31dsh9sqq3gaj504ng908jei/lajulazudofuku.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b9734537a---81554617389.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160811b43cfca2---wopurunu.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082c18e207c8---niweg.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160768618b4926---33608993572.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6fe3de129fee39233483a0d901a00f31/96213762038.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750a27d0528---59457766778.pdf
    • https://anjingliar.com/contents//files/40694607311.pdf
    • http://turinhotelcompany.com/userfiles/files/24354040160.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104282131509709.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078bbfc4d215---78147838017.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83c01d421---81249810969.pdf
    • https://jdrum-music.com/uploads/ckfiles/files/3640114419.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/5fa5851a28d8009901f8bd42a47e062c/75581791884.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f73547a2e---18467377526.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845771ede68---maxepofuwijupogeruvejij.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/kcqgcjiufgr9ih509r7vfuj653/42610541285.pdf
    • http://dainichiji.com/upload_ckr/files/gezowolebokat.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/e89imf2i5v0m83cta0a6og37q0/40484674548.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/qa7jb3qhf4le90v6bp3245hibq/37781572758.pdf
    • http://frezerovka.by/images/fxeditor/file/pujekulajagevalejosolaj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=twisted+my+back
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc9e.bin
24d53bb84ebc41553cc83e75b17909c33013906dd4d3cba575aaae8ae3315066
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 16988 bytes
font_01_sfnt_off00012893.bin
6112163c0ec241169b7b520f1aba997c26fe896f5a80017578d8b84b9c577960
pdf-font-stream PDF embedded font (sfnt) at offset 0x12893 10556 bytes
font_02_sfnt_off000140cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140CB 16792 bytes