Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ecb58ceb5bda29…

MALICIOUS

PDF

84.3 KB Created: 2021-06-27 02:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 835d70712e74245c20fc2e8e4ac99fd1 SHA-1: d416f839333d3a5862c7268d143b410c4008beac SHA-256: 11ecb58ceb5bda292c0456921b53f85848d4a3b1fa12a4f83b51090da6ccead5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous links to potentially compromised sites strongly indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be0e5e4ff11---badarizarexagule.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086537325c94---vizawugizurudupodujo.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2d757e14---5779868483.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8aedb6ebe---52313677406.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/cc5obtk2moulf77da5tul6q8f3/61518469051.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/4ce9e55d92330d50b970a221dfd477aa/55601142405.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/rajapavipewuziruxawoki.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ced80d8323---jizodazozozetenabutinirup.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/f23472e8937bcf85deafd8bf9ec9c6e7/rakisusepuno.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/1ne6ag7esd437ii5kiuh567643/25371382198.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/579eb9cfcdff199181d2ffac37b0e0b5/94344640543.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863236df302---81201010269.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc1865468d---96349950914.pdf
    • http://telekommarketing.com/firme_data/files/pajazawibujowa.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072f4f47cf8e---dejagadelopifir.pdf
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/77602038460.pdf
    • https://avigailpekelman.com/sites/default/files/file/gisewenufutibixisuj.pdf
    • http://anandamsanyal.com/userfiles/file/muvidegos.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/8d86c0903bfa94022d3c1e873a48e506/mudofafo.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b147cdfb8c3db46ceaf238127dc1d1f3/10965826455.pdf
    • http://skrabl.pl/www/rpbd/fck/file/33650309250.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1822e46e6---97400002148.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/e819ff68565585ce770a804e2a6c05bb/piseveredato.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cheat+code+for+coin+master
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb791e694d---fafukusepanupirobun.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_off0000e75a.bin
bf4f6852f896056c230538aed260d8435cf0604a29c9339d4f8b6dae916c1a50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 10728 bytes
font_01_sfnt_off0000ffd7.bin
fefd54e91592d43ec35a0e4e34335da53e4695225d04191f6dc5d09c40c32465		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD7 16380 bytes
font_02_sfnt_off00012a31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A31 16792 bytes

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