Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2628c596171778…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 09:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e92208a8e09b38d8d4ec1d96b7a4a112 SHA-1: 4644de7f2821a359e1cac7eddeba41a06e22fa78 SHA-256: 5a2628c5961717782831789830a3e20b0489cffc0f2d6af0bdfec16fa639c8e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, flagged by heuristics, indicates potential for further malicious actions, such as downloading or executing additional payloads. ClamAV detection and ML classification strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://agriplan-rs.com/dados/ckfinder/files/18865608121.pdf In PDF document text
    • http://studiotecnicopinto.it/userfiles/files/fulofavefapibe.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9697fa8113bdacd4ad6235274778832/36407269462.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/5171850132.pdfIn PDF document text
    • http://tayles.com/uploaded/tabutabalapemuvi.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/92053487766.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613abfff8f9ff---giwubeg.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/56671358934.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/43864732463.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/xufejebejada.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/vusimazide.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/83696115523.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/60417003672.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/31249798442.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/dipulogudos.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/tadozukumosufubud.pdfIn PDF document text
    • http://kasargod.net/uploads/file/torapu.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/74211259201.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/rerag.pdfIn PDF document text
    • http://hbaoge.com/upload/files/zusesofezapaposipi.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/gajixa.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdb5c17e5e---lonofaratanosukibulusef.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/jidatidupi.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/zuwawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+font+arab+untuk+androidPDF 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_off0000d9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 17880 bytes
SHA-256: 5044baf20f041d3695bf5567700e0bd5c072942a682b0e518386561042a9be01
font_02_sfnt_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 10468 bytes
SHA-256: 53422acdb7c164b8d6e29681bacf555113a470179b7869d1857c725beacfaaa1