Malicious PDF — malware analysis report

Static analysis result for SHA-256 566da993d8a377db…

MALICIOUS

PDF

87.0 KB Created: 2021-09-14 12:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d94af4efd69d207cb495169e3437b570 SHA-1: 16cd9062a0e23046b3099074e1401d99a4ae6931 SHA-256: 566da993d8a377dbe78f4b9ef43fc11ac1cd6481a8b0cfb387dad96d4e54c7ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16137120150c3a---rogimizixobuziridero.pdf In PDF document text
    • https://indiantalentjunction.com/milan/media/pasokerok.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/nabejumelokol.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/rumopin.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/59113792586.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/9569489793.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/vekigenidiwulokimafag.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/17604617165.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/85q0282cgns5t424cj6248c3ro/36518833782.pdfIn PDF document text
    • https://alutat.com/data/file/32499700338.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/58985789062.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/nobalawugevinazogajemedi.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/92895056734df1b9666feda5b2729b1e/73647653740.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/89860585839.pdfIn PDF document text
    • http://aurora-c.jp/files/files/zabevexufamotitubo.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/3154605683.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/wukojipuf.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/korefutonipifuvanujesepu.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210914_A366EAFA15B234BB.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/romakovu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/zufalavibal.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/jirifisoxopema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=my+hero+academia+season+3+watch+freePDF 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_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 11060 bytes
SHA-256: 9f575213266a7e2964d9d54e33d41fc8bfac48909c42d9c267ee10e8f50da598
font_01_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 17900 bytes
SHA-256: e65fc75aad2fb7706807920c12c2faacf8c6a7a2ba84706216ab5e25a1e9ecea
font_02_sfnt_off00013629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1