Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfd442a16fb10f1…

MALICIOUS

PDF

75.6 KB Created: 2021-09-07 01:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 226e16dc83dd21da3176b07af8e9bed4 SHA-1: 9a37f13a65a63d465aeae9fb1c7c68bbf3e15bee SHA-256: ddfd442a16fb10f1c3881fddd7d504310a0f51719c24666d9ddfb3757d829754
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farms suggests an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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.
  • 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://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0a717867---tadikuta.pdf In PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/77058055259.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/72006742409.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/44f1cf88233363c632f74dfa9ef4ab86/69051909299.pdfIn PDF document text
    • http://faradbox.pl/files/file/6563365432.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/muxefajoz.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/41327b733f31cbf319bbd10f6159bd20/12164034759.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210804_014424.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda7bbee07f---damodaviv.pdfIn PDF document text
    • https://0900107678.com/upload/file/besunon.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/cmhhiosvd6l74f4rf35lclt653/rekuwotuwalosojabenidud.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161057936c0f00---38508814489.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609151afb5bd5---26195539664.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/zetibijaz.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/48971288697.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/pazotakomez.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/80649bd7fadd7bf5c424b85ed156ff0b/mulazirotaporumi.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160876e3a72953---dugezunux.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202106/1623185919.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ivpha4tj9uk01thk9l39d0ctk7/44638851893.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/womaxobowos.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/15276025559.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a4910c9ed8---vubaj.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609131bc0b97e---86035308698.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/e0e49b228397bef26db8daad02580899/52044586795.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/10053756376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=c%C3%B3digo+florestal+comentado+e+anotado+pdfPDF 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_off0000bcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD3 11132 bytes
SHA-256: 54bec27453dcdd69d5cc92ff53dca8c9c62d185bf0066245d082154776da458c
font_01_sfnt_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 19216 bytes
SHA-256: d09b085ed4b7a5a105e4052c2fc4ec27c636d10338980e7905f5b58d627f134a
font_02_sfnt_off0001061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1