Malicious PDF — malware analysis report

Static analysis result for SHA-256 b115c33dc8c6ee05…

MALICIOUS

PDF

77.8 KB Created: 2021-07-08 02:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d027a94c5473119fc801d7a2df5c561a SHA-1: dc2cf9c01071b8a54e8192658818411eeb792f4b SHA-256: b115c33dc8c6ee0522c52cbed4d78c97421bc9982f82e0efe5cc2e867ef0bd85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of a link farm on compromised infrastructure is a common tactic for distributing second-stage payloads or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824a296ba43---voxafokumoleketejesejo.pdf In PDF document text
    • http://essiac.cz/UserFiles/file/sibepazaz.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/lutuzomezal.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/eab6a2ee242f5066b33151baf540ab0a/sunupoxixifixesilame.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/1nbsfcd1c74s5ef0i2h4lquqd6/kijotewelebutegafigo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608122f0cecba---rozepimededar.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077c30f845d2---dikukegudekewaru.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17e0667377---mesexapepuka.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b428b205f---80243063312.pdfIn PDF document text
    • http://fxmeat.com/upload/file/7e94ed360d893fcba836b7cc36d14a87.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/43975931573.pdfIn PDF document text
    • http://lagrupacio.cat/file/povotudedona.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/58471915523.pdfIn PDF document text
    • http://pvvc.cz/files/99385394775.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5213006cd8---86707729927.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9cc48a782cbf0f15d5b292ba2630fac2/5338420633.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/98701333447.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-12/20210512150959313819.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/punaxuvuxip.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/enpumbfif1op4l87dc928lajl3/19519797241.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/ad9b7e4ac67e4e4f5d4b5b58e8973672/28687723866.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/55e658a970f65c49f69a342e7e8b0deb/gesifofepafuwejowoguzaz.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608719093ba28---xojudevanokigem.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/fixipefadupatovunonetov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=witchery+mod+downloadPDF 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_off0000cec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DB 16632 bytes
SHA-256: 87df09e8a41ddc7675ef5b5854ba0bd81021377d74605fe310b1a0eeefdcaa8f
font_02_sfnt_off000111f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 10660 bytes
SHA-256: 16113c4ba4efece87d9dc56a71d4015a9bec59a95214bf895f00a73f4f8a017f

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