Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b3df117745ae9e…

MALICIOUS

PDF

81.8 KB Created: 2021-10-06 01:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1dc08ed302e4df634181da4cff6c0e4a SHA-1: 324b926862399669c202b7dbdc8b6d318f90b50f SHA-256: b1b3df117745ae9e6593789657927e3fc8c9bd5bb37863c5f901a80e792214d2
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious actions. It also features a link farm pointing to compromised websites, likely intended to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=free+download+converter+from+pdf+to+word PDF link annotation
    • http://bachova-terapia.sk/images/file/xupadewezefugugu.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4218d15effe28867183b6783caea27ba/70665951532.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/78565152771.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155c71279136---jamobenazesavu.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/lonexejafasa.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/kasodinaxitujex.pdfIn PDF document text
    • https://grancom.by/upload/docs/sozufobuvob.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/158045540.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/komojanuxadikadajufegez.pdfIn PDF document text
    • http://reopen911.info/media/file/67517058578.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/82374562605.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/xeratepikozibazerik.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/noml02roefnb3vnsm9mghnc6c7/lidunuxabosudu.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/37f793bfa7be9f807ac5add5fc0e2a5c/jolinakegujagowofabofazo.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/varigupitunowedobuji.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/zufizadupasezupel.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab7a0e451---luxalibosipuzide.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/91360227117.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130996228908---59642446946.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/52524144220.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/tuvikakukomopemogonoke.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/sosakimusikozutoxi.pdfIn PDF document text
    • 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_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 18072 bytes
SHA-256: 9050f98cded3a40d2af06799d7251e527af1e6cbbbe5e5ddff3ce76129e7fa66
font_02_sfnt_off00012148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12148 10648 bytes
SHA-256: 2817a82f87fcdafd62090ab2170d25a1a16ed672489dac57a12b16ef3d2037b5

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