Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4d2700fd6f83ba…

MALICIOUS

PDF

74.1 KB Created: 2021-08-31 00:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ca398521bfaa158ce78df61dad3753c SHA-1: ede4b9d2b8f6332995862c477719acfd1efcf1d8 SHA-256: df4d2700fd6f83ba484e35cb39dea6897c22282918fb375290d084e4d88e0645
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

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://crewmak.ru/uplcv?utm_term=st+mary%27s+rao+outpatient+pavilion PDF link annotation
    • http://unseretochter.com/images/file/68947102534.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a86868e08---26244882457.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/welideg.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/17848717149.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202108232318336748.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/98141213376.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/68605897903.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094337682384---6140222509.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/zafuzatavanaxovorifafat.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b35041f250b---mawubego.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/19f6e222cda4af189f1e00f392c398de/nolokexov.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8ac60199---gazenosaziguvidefe.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/84f5c7a4f88ae68d886b39aa31dae822/jesaxovewilatutumibuzib.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/jedugagamalizapunefawe.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/getogofutadi.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ffa61f5f355---bomawovivusotatomezuji.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/t8i3dktj4imrn8fp62iinukp31/buxiledu.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/41426874303.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/34759327571.pdfIn PDF document text
    • http://skupka23.ru/upload/m/78645032425.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/eaff608893fa4381d7833a657118b9fc/wozakotapotinanukewudad.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210616_204654.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_off0000bcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50A 10804 bytes
SHA-256: c703bc9f9bc200fe78ee04e91de7c44a7d2875ace99dde1ff33b2f432fe4c1f5
font_02_sfnt_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 16652 bytes
SHA-256: f4c94fbb3700265d051f707b08e3c5bfe680c81fafb35ef65c236c5f710537d5

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