Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5529d21585d2815…

MALICIOUS

PDF

111.0 KB Created: 2021-09-01 16:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc249ba05b2df71c57111e87ebb39d52 SHA-1: 338f743e41a99a504b5e898cf3d8ec0cb707c218 SHA-256: a5529d21585d2815d565accb4b30ddd43fd814761b83489e5430e4600dad66a0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to malicious content or further stages of an attack. The document body is unreadable, but the heuristic firings strongly suggest a malicious intent through the distribution of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4ba861dc55f23a6b89aa05f4de6c1c76/werufuxumago.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/dfe9101b50634625b242805e0dd5388c/62799787913.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/57554678051.pdf
    • http://krajinar.cz/soubory/files/26450549790.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e9032288668---wawanadexo.pdf
    • http://freetourscadiz.com//ckfinder/userfiles/files/22644487524.pdf
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/5461856306.pdf
    • http://cobmedia.hu/include/zowebumudama.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608655c7cf7a2---87077118110.pdf
    • http://hondatayho.vn/images/ckeditor/files/lulaxugutubonu.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/muroxufidijojo.pdf
    • http://areawifi.com/DESARROLLO/userfiles/files/29311676704.pdf
    • http://tbff-bygg.se/img/files/mawupaweg.pdf
    • http://masan315.net/board/imagefile/file/44254179815.pdf
    • http://coffee33.ru/archive/file/52150562384.pdf
    • http://urduhadith.org/survey/userfiles/files/muvegojirewibixifijo.pdf
    • http://cx-gl.hu/images/files/xojiritofekorudexeg.pdf
    • http://billedbutikken.dk/articlefiles/file/37464040075.pdf
    • https://digitaldaya.com/imagenes/file/bemojitoweki.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7154a830c297998980ee33f5031c9c8b/5762412271.pdf
    • http://protok.pro/upload/files/69013206879.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=campbell+hatton+fight
    • 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_off000149ee.bin
e1a019ecf90cdb8e7da306e8be9fbf33e06c90aebf9cbddfc178c001ad30c979		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149EE 10708 bytes
font_01_sfnt_off00016210.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16210 16792 bytes
font_02_sfnt_off00017a22.bin
b997601b70586679e89f23fc58b0ce3d730443fa878ae5b9c04200d336fdf706		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A22 20260 bytes

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