Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e94c79cc83eb85e…

MALICIOUS

PDF

74.9 KB Created: 2021-06-29 07:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 483c98fac7d8519052a8b1a0badd2254 SHA-1: 97e24f63b0847f5bd59107c8a8edd6e51da5e4bb SHA-256: 8e94c79cc83eb85e4f25d5f721029722c3e09dbfefdc5ee0465fc9349ce93bd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading malicious content or visiting phishing sites.

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://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/hdfracok43j8joeiv0mf3421rm/matomaferijobuwamivuz.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcbb86679f---ralagarus.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/n468jlsjq0i3ab0sdcadft473j/jetamuxifenus.pdf
    • http://hesexpo.com/img/editor/image/file/1434578724.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087add5bf184---77943765692.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874ba64d1f7---jeretorutesetuzo.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b9921988a89---buweziz.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a62134062---minagimerimerewalivove.pdf
    • http://dynamic1984.com/user_file/file/wegewesiposezena.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/umnbquevgajjveaf8qkmt724b2/17796195190.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a517143d2bb---topoxokosogixik.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/6c86259484f9281085a9801721b09d9a/luwasez.pdf
    • https://powermailer.in/userfiles/file/97332750437.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/1d858517428b66922232628266540055/11192328331.pdf
    • http://ourpreferred.com/userfiles/files/nozubogiruwe.pdf
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/144984de728f722e29d3734272c518ad/petikonotorolibopa.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1b100efd---kusuvevun.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f82b50272208bdccc7a0744bdabe60ff/17648604254.pdf
    • https://kitapkaplama.com/upload/ckfinder/files/21028919941.pdf
    • http://autosoftware.company/autoresponders_images/files/46671513965.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846cd0320df---83630889879.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/t1kh9vfdosq0rm205knucp925b/koguv.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/boman.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e95f4c32bfad0406029575dc5e75c716/vajenitatagilaxewofed.pdf
    • http://radissonhoteltraining.com/userfiles/file/janekowutagu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=top+pdf+to+word+converter
    • 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_off0000c5a6.bin
7e5dd20dabf3a2bf305b612662bda5a675589950a322416a189451b89c690856
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A6 10260 bytes
font_01_sfnt_off0000dce6.bin
79ab448e0fd42a5929978137d363dafc8b949e177d7e0249e412e7f3b03d6785
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE6 15900 bytes
font_02_sfnt_off00010642.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 16792 bytes