Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2f6d3530296449…

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 19:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fe3ee7ab5c1cf5763abafe666335b6b SHA-1: acdcc9c5ecb3e49a1b6b275464dee1e8dc211c85 SHA-256: 4c2f6d35302964499d82ea96e26f6362922fcede1b27ea1a523b11a5e90d5ceb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple external URIs, including those pointing to compromised WordPress uploads and link farms on disposable hosting, strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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 http://fygl.net/uploads/file/241719433719.pdf In PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/26850133435.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/petigokalavugexiburudit.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/kakakemufuzili.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7883b91c2---46909851692.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928b2b3b844---58974068628.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612a517063d4a---mafekedelogidojisamar.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/xodotirigetoxewalenipobuf.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/nadazu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bbd0b6302b8---12624269460.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/3cff1a317448ef7a5797f54d682e6c73/sibamosobitiriliradu.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/1687046886.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/11415275284.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adcaae712f1---dezekemubusozilujaneg.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160864cf14a21a---39195193496.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/weserisu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/be080658998357fbea21d6a16e0b9f04/27716087447.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-8-25/20210825071323923686.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/8192717005.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/lobuwuxibopijadad.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/vsp6b6450323lf5vt90gbh1tqg/7692688880.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/xalegosalabugepunuj.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/es3rn5a95q4uik0t258a1oso46/66712416753.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/34909492407.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/rotusek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tuckman+team+model+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_off0000d3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CC 17500 bytes
SHA-256: c78c1c97f06320b00286a0a1d35b741caa31fe7621be4e81e42122243f24b03a
font_01_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DC 10576 bytes
SHA-256: 984c62c88e9a7aa1600358c766f5f779ace0a17e024aac4246b2950def32f3f2