Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce5a3da11cf6f50…

MALICIOUS

PDF

89.5 KB Created: 2021-06-29 03:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b4058f54987817d119d2c719ae78574 SHA-1: c5bebd23f2b0d1dbdef1aaa7d0bde77ab1eebdb3 SHA-256: 2ce5a3da11cf6f507fecdcbff26877246da76b6889256fa8e56ede869ec15cd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan indicate a high likelihood of malicious intent, possibly involving JavaScript execution or redirection to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ps90t3vf5fg7nac4du3lp1baih/wenefidadavasusalubixaf.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b064dd9956f3e5a1c2074f04e92eae09/lutukibetazujejokozenuban.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/98s1faq5ma7r3orpgimcflk300/62552932035.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85368d9916---40771565087.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d47f7349ed---wobarimub.pdf
    • http://kco.su/userfiles/file/54161089469.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d02bde22d7---bimumasekikozuvigol.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f111b9dad3---jumekid.pdf
    • http://studiocalcinoni.com/userfiles/files/92785427135.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/18vgpqt4b49bbhpldc7iojk8m6/58474910478.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160962233ae23a---kawoge.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17ed48817a---xofokidijukeso.pdf
    • http://yourtruck.be/upload/ckeditor/file/69872905948.pdf
    • https://bjsteelvietnam.com/upload/fck/file/vojudakosifamoxa.pdf
    • http://beijinghuojia.cn/userfiles/file/80844923158.pdf
    • http://pozitron-s.ru/userfiles/file/30439825083.pdf
    • https://estoniapools.com/contents//files/41163325462.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/991322a7b1e0244310de03de14f2ce5c/gamowibevedisawisatumi.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099ffef4520c---15182674386.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/jvrhmqeukd8n1kksrsga797jgt/sukuvilidig.pdf
    • https://lesfeesdelhetre.fr/upload/files/38561220100.pdf
    • http://aucoindeshalles.fr/menu/file/rekinirezeginiza.pdf
    • https://kompaspt1.com/contents//files/zivokaduvon.pdf
    • http://agataklimowska.pl/userfiles/file/foxidovegejomibad.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=spouting+in+tagalog
    • 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_off0000f818.bin
e423b4faa1e4f01810577337d35d9291539214e90c1cbe87e48d2194d64099b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 18684 bytes
font_01_sfnt_off000128a8.bin
7835038236288cb23128cb792c37e71b921a7ed2c76f5d8691a2461d8b0fd827
pdf-font-stream PDF embedded font (sfnt) at offset 0x128A8 10204 bytes
font_02_sfnt_off00013fa8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA8 16792 bytes