Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4618e0c5afa86f5…

MALICIOUS

PDF

73.2 KB Created: 2021-08-28 10:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ef41a863fb3b3d6546af070fd6f2ce6 SHA-1: aebf752e447607327123ea209423f3a27165a081 SHA-256: d4618e0c5afa86f538f6c952a7221ec2c0f6d5fbd280aab2b5ad22b2216d4f29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/de571e3502628643ee46bfcec8dc025e/3248205771.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f865b7243---4563889053.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abd1892941---kapabegekowado.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/gdf0cu5kunp3mnrrh3dtt8rtca/nufusetupagosevufopiditum.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa65c057e---torigemegiwopugoxebowe.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fc50a4ac4---bonodoz.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/44802784791.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/66878550457.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/sojijafigonazo.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-13/20210713183651695453.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/25175661965.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/i2rphk29h5p8ojdkdhov9fklf1/93366487614.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/mojep.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/xilewevofelipuzal.pdfIn PDF document text
    • https://ridersshop.it/file/29044932961.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0817fedf---dosawoliw.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dc0d97d4147e3c702fc90f653f396939/dixesavijitazukufazazuma.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/54621970b4ba506dfea0954321415f7c/pedodafufir.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad5c977e6---32829782837.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ea2546003---weniw.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/8a0216decac352a902df5e4cfef1de41/71900618661.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/75f985a8b21d20e95d079eff8d6e6a31/18407411220.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f133c7bc---defozabago.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/ruwasufoguforif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=read+a+child+called+it+onlinePDF 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_off0000bd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54C 16072 bytes
SHA-256: f156e36897117816f1e7a67d72190f207aa6fde5203445f6c12ff1da7fac4fae
font_02_sfnt_off0000fe26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 10244 bytes
SHA-256: c7cabcbbef006f450d350fc4f4eea4b2a42605f5e52ecb218a0d51329c9ebf5f