Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce87a9e42e19070…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 22:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3e501280974a449cbf32f1533c31045a SHA-1: 1fd58da454dabede0b551ff590126e8c4a5a813c SHA-256: dce87a9e42e19070c4af24ddc3a5fa23726e03feb946c63b663ab07a1ccd1d2a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lure victims to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://philabc.ru/uplcv?utm_term=fmovies+mirror+sites PDF link annotation
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/l3b0t77h353kbv2mb5t6grd112/numezukirun.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/nemawotarojabufuj.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/41578602373.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/21091412532937013020k78.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b378ec1cf5---98648527094.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210906092410.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/kasuxut.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/45248749235.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/laditu.pdfIn PDF document text
    • https://biomisszio.hu/tmp/46490405363.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/vuref.pdfIn PDF document text
    • http://klhl.com/userfiles/file/80745609455.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/kubudokudazusofubizidubu.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/97840641479.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/kamitedagilifumuvome.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/47589559494.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/sexatinirotelisewobuberel.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/99228103340.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/kanonejagas.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7cbc8e83---86535218821.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/mumebufebep.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/befopuwujot.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210911_ED7CD114E32D248A.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/31984525697.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/94953902473.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/33153059841.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/xapabuxur.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_off0000dfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 17560 bytes
SHA-256: d3884ff786b1b3d4283af08e773fbd4b4b26d82982f0d9fec26ec299f472d9c5
font_01_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 10000 bytes
SHA-256: eb32e0f5f77a55516a900cccb5277396fd9cf15305690d2043d01f3ddb7ec4ad
font_02_sfnt_off0001242e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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