Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5103de87171020b…

MALICIOUS

PDF

83.1 KB Created: 2021-06-30 03:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6d8d42bb72731082c31b22052818365f SHA-1: a265f15afe0acbcec339ad6d43afdd0b9db2329b SHA-256: e5103de87171020befacfddd0ee8f54f5f9caaba8168c5c906c7b650983442d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised CMS upload directories, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware via the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://dolaodong.com/userfiles/file/2468807053.pdf In PDF document text
    • http://montaze.org/democms/userfiles/file/61286681724.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/vufobuwinujelalufa.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/junosipugezef.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddac0cd00e---wilawuvopubefokadi.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/susuk.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/o4e8f89t08b573c5eqm2ha120f/55640153260.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/107f64f732174d81dfe55499b5c8015c/gudolimovusuzibinadu.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/7bca50038196d55d3cc387163c4d19de/84216121324.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/jonipukimisesa.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/fusurekotali.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b951f6ede17---zotidekuzapedopaxu.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/ganomepomorisugomo.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/3620eb1e8fdd8d4aa0f627cc042eeaab/xeridowidunotixorisemovod.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712e474633a---bowijonimolutotij.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/64504083719.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607f95f34109f---15675403952.pdfIn PDF document text
    • http://garderoba.sk/images/_file/forunibanokoxaji.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d136256d2---41883362295.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/7c60dfcd679a89ece213ad65e0c6f54f/topixev.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/edd73c0cc59e710cdc22f216d7ab3ee6/kiwimogatenisopipigefaz.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/97260594804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=libido+meaning+in+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B2 10592 bytes
SHA-256: d0ed13358b63158fc9d241ce3a210929f2d5112ce53414ab71b03a4abecf8b06
font_01_sfnt_off0000dc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 18172 bytes
SHA-256: 87967857941899ac80dd4f36fed0749fe11a760678a6964f66523e3374716b64
font_03_sfnt_off00012482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12482 16940 bytes
SHA-256: 8d6841289db473f3bbe5dfc62594158f074129be916e9e5c1e4bdf8543037c11

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