Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25dcf35482992e8…

MALICIOUS

PDF

74.8 KB Created: 2021-07-27 20:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41950b991a2882930791fad40737fdc5 SHA-1: 988e67bf8df6918801d89197aa713555a9f7adc6 SHA-256: a25dcf35482992e85b9baa10ae046d26c846a1e55b8c3142308c8a5a0bda47d6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links aligns with a phishing or malicious redirection attack pattern.

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 http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e8d1e3a1d---kumamumenujamovos.pdf In PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ecf1fda88fa4d74dc6997fc86d72c9f8/34695969703.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/wawixofojupanoxebabasuj.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607827e1a6f10---sidavanuna.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/31725881153.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/8dc222621112b0fe3e1a630a7fd9ba77/6243795158.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/68776038325.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/rb1qsah3k8dqiojovn87e14lco/25234468501.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/907e8c9afad5a32d448da14c9943870a/jovitodunibeloje.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/wiwarazafinovila.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084057917bea---bisozilogajevifafozam.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/nipemosasibibuk.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2172c63a04dc956160a68448f509a845/57296946813.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/zuridemezavi.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd11a32627---favibetitedodilixago.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf4c06696a---bekozisakizexodusetavipu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609416a39cb3a---pesidujoxisa.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/nakizi.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/danifalusabu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be117ab8e4f---lajevepebo.pdfIn PDF document text
    • https://kham.vn/userfiles/file/sunoxipuvimonifobajumef.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b0d2c0b1baddf9b9d63dd0680faa1df4/77025054370.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/mijovopewojesibu.pdfIn PDF document text
    • https://paperland.bg/uploads/file/51223059652.pdfIn PDF document text
    • http://tiurll.com/1m4q1uIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=atul+purohit+garba+mp3+free+download+2015+pagalworldPDF 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_off0000bde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE0 11684 bytes
SHA-256: 9872d8b5bda0965ce94f6299683f7c80273010ae8126e2282e2624096831ba67
font_01_sfnt_off0000d948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 16392 bytes
SHA-256: 56912838ece24dad4f42e938cd8edd5dfb124930a4aa2f0a2de686b14c7e1547

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