Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2f66e1300014a9…

MALICIOUS

PDF

75.7 KB Created: 2021-06-21 18:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0515c7afe469a4f8f761d9e517df9391 SHA-1: 1078eb9a3cd585fe86108ec7bc1d163f38cc5130 SHA-256: 5b2f66e1300014a9102e662a4a50cd06681dfbd42dcf165ca80c5784d9dee036
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://elcampoeco.org/FCKeditor/file/fulupejalaxigi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a10f59d9b---68200073739.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883df063067---zodokusijimilal.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/v83qfmam33ee787u4p39ao5br1/39703906454.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfd1136da8---taxomolurixinoferusasarik.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430025939287119.pdf
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/vopokogozez.pdf
    • http://jrpst.pl/userfiles/file/kelemawuzunawuliwobe.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d11bba536d---musazumutadevejewamose.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/3bf41b4da320c050c90f6272412ccb69/77079825753.pdf
    • https://akapacha.com/userfiles/file/37363006211.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca7486d81---95094417652.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/80386571806.pdf
    • https://krassimirtaskov.com/userfiles/files/sijetibovu.pdf
    • https://systematix.pl/userfiles/file/72845818654.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a79d550cfeb---3763615930.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/766h4hd737r58nv4n80q329t13/gobelivewowemi.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082718fd6730---mefajotodolog.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/7qo1se3o6bdc0579dsc5lin4gi/88081224516.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=lord+of+the+rings+3+battle
    • 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://scripts.sil.org/OFL
    • 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_off0000d4bc.bin
9aeaefefc084cadb46b34c4f24edbaf51c28d32e1959678ea02690929f9f6d0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BC 5416 bytes
font_01_sfnt_off0000e723.bin
23624acff844566aac513082f2185fa435b5cf56b7b2935097599daf33498892
pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 11344 bytes
font_02_sfnt_off00010ce2.bin
4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE2 16060 bytes