Malicious PDF — malware analysis report

Static analysis result for SHA-256 eccbfd933ca017ae…

MALICIOUS

PDF

87.9 KB Created: 2021-07-02 22:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c927e549a610c4086d1327d84a2201e3 SHA-1: 904ce41bc3b3df6cbb75650e6ca94b5c0d758fdc SHA-256: eccbfd933ca017ae96ba01403355c24590e953cdb7e81abdcc589908b06527c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI links further supports this attack pattern. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=yoga+asanas+for+weight+loss PDF link annotation
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/2710te079vs8oc9cgrl45ejiop/jugujize.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/qtu92cs72smkrbjpjf35fieas6/gumavamukogokejitefogom.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aca0c88209e---disavez.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/resupakidizimasobekenobex.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/49591020941.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/zumavonisuvumegovetow.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/7d498a7e2e723eb1574a1b1b143f4114/ziwolojibatirozilij.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/rusuwezorowub.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/zevobulasujojodijexubawa.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/61445f65972b40c18866d25b84fa2059/36745830267.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a8447ddaa---45820395311.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/jo36vtkej5g5t9eqbebkj0nr17/39211039311.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/wadinewuzozitig.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/695674357bd94fc240e0526e2bfd1f1c/40086847990.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/5vifc66rhk1q8fhb49fs622hn1/nisevagomenumirizagav.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4184bdf8a---42025023800.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/vabonuzaxetuligiwetuzil.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/q94m8ivtju1f9j60r186g6pk52/jumolesej.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/84973426970.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e83006f0---koxupigiputemesodupi.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/59466293623.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/3753219425.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f45efcb34b---45110629043.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/k3137mn771aksr73fbaqtbhr50/58429409116.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e2d62f2b57d75fc85b09e53836506f99/magegazikaderagexepafem.pdfIn PDF document text
    • 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_off0000f48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 16828 bytes
SHA-256: fa5b5d01ec96a78d296e15b5f5b11f0bc3ad7fd48c834e1b0e74a416095a563e
font_01_sfnt_off00012070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12070 10564 bytes
SHA-256: 20e251db8c032ad0942c669a9e9ebe573fc943920f06e828bc254900a75f1eef
font_02_sfnt_off0001388e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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