Malicious PDF — malware analysis report

Static analysis result for SHA-256 55583d1a848eabb0…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 18:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3c3c369fe7cc2d7198c7fa89883d76df SHA-1: 4090063efc40cc37780a39d239af5617bbf509e9 SHA-256: 55583d1a848eabb0e395a02068eecdb169f0cedd616d592857e9f5cb2e3957eb
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=germ+free+animals+pdf PDF link annotation
    • https://sapsda.com/SapmaUserfiles/file/senuwowufofurom.pdfIn PDF document text
    • https://irrisyst.eu/files/file/sesomoxatab.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08675a9ef6---zaxodaminijus.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061709285857.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/burodedovixojut.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/55718849904.pdfIn PDF document text
    • https://alutat.com/data/file/96388266257.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8661d757---770624882.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/40228069476.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/147001709612d2c5fccc2c.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2dad62r1ftqr96ku4k42p4h704/dewulozatatuziz.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/372c6ta9ptrhbkqknfn72j50e9/zoxugexevusadadul.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/62248835277.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/c61nlg9feantqkgsh7hd9lhjgp/12210055389.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210803_533B285F7A5681EF.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/1723412592.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb9c6cec47---memorurowogozef.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/42931158211.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160948adc1e0ae---wanozadalekosenasipajafa.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/40814426396.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa050874374---wulumosugebawawafuna.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/temovigodatesenareme.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/3302021233.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_off0000bbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF5 15964 bytes
SHA-256: 28f536baae6b6c7d96ebc7fcf8c486139779e7be1ad5f2b203534bd1d259823a
font_01_sfnt_off0000e4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C5 10480 bytes
SHA-256: 027a27e38e37981ea2968ec0bbf6fe58b69a99e9d54c1a485f5206209af83bd5
font_02_sfnt_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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