Malicious PDF — malware analysis report

Static analysis result for SHA-256 7016ed77240ff335…

MALICIOUS

PDF

88.5 KB Created: 2021-09-16 10:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ddf5571e438a8e61bb55c37957b67e84 SHA-1: 1c75805958408189acb2e636d17e1e60df1ab9e1 SHA-256: 7016ed77240ff3356d41dfc5ace7360013a400b927bb17e798eba16f5a284768
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=android+1+dream+league+2019 PDF link annotation
    • http://studiospazioambiente.it/userfiles/files/tapoxozu.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/furalujaremuratijimo.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/pedewi.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/xutinixede.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/de14749c51a7f3511a5dc9e7bbd0c98e/68742066726.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/diwunobefawukapemejulevar.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/sajoguwus.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/4614128108.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/sozoxuvugegijovo.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/tapag.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9a603f151e7edca2d9b15defc1f20ee9/kunorusule.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/42910130894.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/54552146877.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9a9a3c4fb---56342634993.pdfIn PDF document text
    • http://reopen911.info/media/file/67427801544.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/52231555141.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/95602900611.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210907144859.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/80206695903.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/wugebizabemedot.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/vubakekuvude.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/35063912773.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/32874492665.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 17056 bytes
SHA-256: ea74022cd8ee6366f41f1b99e918706e5e2b98dc75d9e03d08ba0a00d81565b6
font_02_sfnt_off00011e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6D 17688 bytes
SHA-256: dca551321934ab93a3376e79a197f39f832d2806681a7cdeb5c234af43fd2838
font_03_sfnt_off0001397d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397D 10868 bytes
SHA-256: 9ef0e52d7780cc3aeaf26f481572662f1b63645825a20aac4b51668226570e52

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