Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf09fec30d0bafff…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 00:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dc68e4a0809afa6fcf01ede0b373ed39 SHA-1: 670c4d48e07ceea09a5c6a1c241c1c3534a74f6b SHA-256: bf09fec30d0bafff986561ff106b14656b3c0c0ec5c03d8d5dfed55737b03c5e
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, directing users to various external websites. Several of these URLs point to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish for information. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://oniceh.ru/uplcv?utm_term=esercizi+di+grammatica+italiana+livello+b2+pdf PDF link annotation
    • https://chezgregoire.fr/userfiles/rozunopu.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e99c50e82---xuzazexozufulewinete.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210722161240121.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/nipitugofuwejijokupip.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/ramunexevarovoromirusile.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/36396163793.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/junidulujagopodexituzot.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/21cb3cbec5fa5166492a853e1ef1ce77/13124011199.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/41172525514.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/jetupi.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/232878412c222b4a5e04b8d43082d581/82111165243.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/rovexovivuziv.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/8b9193b61b2a10aa8f8920be80246f01/vuzavidujuteguvume.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/limitigiwovuwoso.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/22468008723.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/45468878742.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f06f51870---deren.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/1ce71c72a3d1ad9a6abbdf11005c52f9/74910890366.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/divutokaladezetoj.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/jixixegelapa.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b19682291e52314566d0d8a09a768a53/75379066682.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/56371293151.pdfIn PDF document text
    • https://uudanbury.life/files/file/jezerenijo.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081943b8d4cf---27255044476.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_off0000e0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 11332 bytes
SHA-256: 1a2f4b0822d028024d3058d868fc1bf42397d579813d0e0a3089814cfd4a0ea9
font_02_sfnt_off00011325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 17556 bytes
SHA-256: 055e09ef70b09b49fe7cd2bed8cec75a000a5f1652ce6baa103bcc7f31bd9175

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