Malicious PDF — malware analysis report

Static analysis result for SHA-256 183b079bbf682487…

MALICIOUS

PDF

82.3 KB Created: 2021-08-18 14:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: b73143da39f20f5b25d7e45bbeb0a2c6 SHA-1: 7fc53b5fed8b1672f5d84ab91f3f525f6abb24a2 SHA-256: 183b079bbf6824878e04626a83f4b951d29983f357d93ea7a5325a57539ce4eb
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 CMS uploads or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceea4b00a3---kezifofuvuwoximerozemege.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de12f7cca9---32693918859.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923f926cf77---sitovazipekud.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/imdsdrqnf2927pcp3mipci84he/dubof.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/daruvubitajoj.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161055848c98f7---52075278595.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/xebuwozepa.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/7f740bd61e20a25d804643a17681a839/51035319879.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/npq37f3qmbae57mo8mi53190t6/62035021914.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/80347391490.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zogibu.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/33695417912.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/94334895829.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/rasogaja.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/88647028013.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/93d137d51759d93246f90bc20278a27e/dilowip.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/7465458110.pdfIn PDF document text
    • http://irths.com/upload_files/files/78502039446.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f27b673dc5---zavag.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b25af146c---27036738742.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/rf8p0880jdh3e17luq1tsb1cod/gatamubananarozofiduve.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/60461230323.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/lugedobobogusekolugovisoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=use+of+the+compound+light+microscope+lab+7-1+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 11536 bytes
SHA-256: c684acbb70e138075057ab985362a5bb7c4e0b2db3cf117506fb6f0e9e7b79a0
font_01_sfnt_off0000f7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 16460 bytes
SHA-256: 9eb3fda6a15d056c564d8145d93af22670893074c531c7154d90db1f4b62a1d2
font_02_sfnt_off00012258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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