Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34901fb6246028c…

MALICIOUS

PDF

89.0 KB Created: 2021-06-27 23:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b8e9e225802747ed18138815e97dccf SHA-1: 20fa85faceb0c50ee5ddc8ce82f175ebda8ac575 SHA-256: b34901fb6246028c88e369daa759d1b8644cc3dce817e7ff214ef08c5f7508fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as 'Pdf.Phishing.Trojan'. Heuristics indicate the presence of a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or redirect to malicious content. While no scripts were directly extracted, the nature of the URLs and the detection names imply a phishing or trojan distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160866d18cb9ea---50019961260.pdf
    • http://efuturesthai.com/uploads/file/libotikomura.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080860f056ef---13892969687.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6cf85b5e---wazajesigiwosufalar.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eabfc7f5a5---64624305715.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac861ee6b1d---64752646521.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/rafojowirige.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59c7a1a5e5---80188559940.pdf
    • https://cairparavel.ro/app/webroot/files/userfiles/files/wobukikobiwisetimoluj.pdf
    • https://acgroupenterprise.com/userfiles/file/99175540501.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aec2c6b3556---rutijaravuwa.pdf
    • https://alrashed-alsaleh.com/userfiles/files/5608948623.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/2d9734cd6b5b40d7fedd05e7253a1914/94560690413.pdf
    • http://guchenes.com/d/files/16385109308.pdf
    • http://omatsuri.kr/data/userfiles/files/lireditekonarif.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ef1cfca4d5158037f7b810ff50e3bb37/xiridavipidi.pdf
    • https://yingzhaoliuart.com/upload/file/xawewavunegirifo.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab16cdcbc9d---kimepowoxiduxukozalunek.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c24b53cbda5636e4c6b31869b7d85ce2/pogulobemodosanowu.pdf
    • https://baohohoanglong.com/userfiles/file/34759746629.pdf
    • http://studiopignotti.it/userfiles/files/15336975475.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/e35b8aaf7301e0cc594320f268bef8a8/nixofamusesatexozizunok.pdf
    • http://driver-jazda.pl/upload/file/7601095353.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/b5fd6299a6e7b3aaa7330809b40aa6c6/kofeni.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/59143b4130d3a7cdb53106583f4a453d/715129365.pdf
    • https://arch.ua/ckfinder/userfiles/files/rilokawilovadejuduzuji.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7afebe2f9efeeb05024ae1ffb42b2500/jabegitadaxuzejezave.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=sequential+circuits+pro+one+manual
    • 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_off0000f484.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 16792 bytes
font_01_sfnt_off00010c9b.bin
f2f3e8c749ed2db824f3a7f14801898ed949078ae195f5d92932e3534e6e6785		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 10856 bytes
font_02_sfnt_off000125a1.bin
eb52c1d87328fdf6614e944c45b99fa44acae9b1e03c6032d824d1ce0cf4ac8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125A1 17896 bytes

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