Malicious PDF — malware analysis report

Static analysis result for SHA-256 625baa0ec4d11c2c…

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 12:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a14ba1136dd919c8a48248a2699d8815 SHA-1: 7bd3861be85f1c27c1daac48c6be095ce1999025 SHA-256: 625baa0ec4d11c2cbbda779033c61fd5f67e3673f7d0fa6454af52cc9430cf78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites, likely serving as a lure to redirect users to malicious content. No scripts were extracted, but the presence of numerous URLs on compromised infrastructure suggests a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/02e7de37c94cfefb7495815733ae8eb5/37904378145.pdf
    • https://kodcomputers.ro/2664/uploads/miraz.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63d5e77efb---93967538496.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9k9gbqiijb3p3johv331gdgfml/pemuvapopibabuzikij.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/78955b57946b282e9ddb610a865e990f/jaxusetuvuga.pdf
    • http://meta-min.com/files/30878918376.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/7849481035.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5e7d555b8---7811918431.pdf
    • http://renovfab-menuiserie.com/userfiles/file/24281592596.pdf
    • http://www.cafeinca.com/img/public/contenido/file/dekusoxabiwe.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/f957c0f0d7c6335370ee32865ec88410/kojugoxutebatixaxifi.pdf
    • http://hitecds.com/userfiles/file/doxonefexagilarakuzude.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160944313cf544---mewekifamogeweraxafaril.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/7frpd7mc509rpdf8br8gu4q70v/weveda.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ug4oltclospqtrh0gmdpmv2m63/faxovaxupavezet.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076e68412f0a---334239540.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/61fb43d888629de36947fe6370bb35fe/nopow.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b494f4dbcd0---bexun.pdf
    • https://llsindia.in/FCKeditor/file/pesuxemanajibitiwifisovol.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/7qtre60a5mlouvq8tkrtdh531j/91949612074.pdf
    • http://allamericannursing.com/userfiles/file/wujabumefeligosawutaj.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c753dfc1a12---62279189586.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/12433776169.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/18b8d34d42e5ed7415280d0fd6059fec/lenibedilo.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nenigumiben.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+blend+using+acrylic+paint
    • 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_off0000efef.bin
bee40e51b440e8cb80350032e99c0bff9da1a059317c7493028a34267b3bb3aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 11120 bytes
font_01_sfnt_off000109a2.bin
7abb14d21d84e4f7dee45465ec4be42fec8c6fb2c6a30b4ea79f694714e5c99d
pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 16988 bytes
font_02_sfnt_off000135fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135FE 16792 bytes