Malicious PDF — malware analysis report

Static analysis result for SHA-256 e653ed264e7f23ba…

MALICIOUS

PDF

100.5 KB Created: 2021-07-07 20:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f947f9dba92a47d64fc258722752fdf SHA-1: 02f1189923e118428bd1253f2307cde693c5112e SHA-256: e653ed264e7f23ba88ed6e933a3d7bca144214f563a78317cbd0a85ab69ce78b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms indicates an effort to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=organic+chemistry+in+daily+life
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c342bdf36110462af82abcf345639184/neduba.pdf
    • http://yonezawanet.jp/units/24250/zcycom/files/74082370129.pdf
    • https://biovuspharma.net/userfiles/files/lovawo.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5b4038530---28404286928.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef139d464a---vemepareruvaram.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a31c81c610---49069791728.pdf
    • http://zulassungsservice4you.de/bilder/file/54198187824.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/kj60kufclvja44si0nop2dvcpo/nolakovebew.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c400373ff6---60455248475.pdf
    • https://amd-export.com/site/upload/file/neradapozoposudone.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/dabbaa2a9fb4c6b267f0db1fb1760777/34667344883.pdf
    • https://sjalikave.hu/pictures/file/49273378617.pdf
    • http://carzip.biz/files/uploads/files/16582732389.pdf
    • http://musikpark-live.de/userfiles/file/17405200204.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/f7cc2932dd27ca2035f305b167e457b1/73808747828.pdf
    • https://aduanaldelvalle.com/userfiles/file/15473474258.pdf
    • http://instandee.com/Images_upload/files/xugojatokodoxe.pdf
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715fc52f072---gezinixili.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aae0e2627---86484412028.pdf
    • http://qtjdb.com/UploadFile/2021/05/13/file/20210513_125734_157.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/c7cu4r7tnbseq2iootgbqjsjer/36083715322.pdf
    • http://otoozevran.com/resimler/files/14741076587.pdf
    • 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_off000123fb.bin
7ca299998d633d65af5fc51ef91717e9d0102408aab9fbd38ed6414fb1457419
pdf-font-stream PDF embedded font (sfnt) at offset 0x123FB 18312 bytes
font_01_sfnt_off000153b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x153B5 16792 bytes
font_02_sfnt_off00016bcc.bin
d36c1e79d67de151ca9c294346e477640e39d00c8aea0b81727cad4cd3affaa0
pdf-font-stream PDF embedded font (sfnt) at offset 0x16BCC 10944 bytes