Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed75a039fdacaee7…

MALICIOUS

PDF

90.3 KB Created: 2021-07-31 08:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f8da7bb0f278f437f2730cd47e6dfe4 SHA-1: c6f57b06447f7cfccd7d471d54ba51717948d2ea SHA-256: ed75a039fdacaee792de5d26b30c7e87f887cc5537046f910caa1d4bfd93fc5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS uploads or disposable domains. The presence of embedded URLs and the overall structure suggest this PDF is designed to redirect users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://garglob.ru/uplcv?utm_term=singer+quick+fix+sewing+machine+instructions PDF link annotation
    • http://cck-brno.cz/ckfinder/userfiles/files/40591982142.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/fuzizisari.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160821104dbb3a---donamusigutuberexinowox.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54157386810.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8c354ec5c---23240834346.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/dr7c5fam9o5111r301gt9unjp6/4203142522.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/78050725941.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/39692198314.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/619cu6a3mm8i1bofn119rikdo0/88747209374.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/kaxavigekoxudijabomanul.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-5/20210605043339404520.pdfIn PDF document text
    • http://954move.com/clients/4890/File/38619588150.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/modokalopewodupixod.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/menogiborif.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae08872fd9---balokujegikedar.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fbaf74084---votasitarenusebiwuwajega.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b732e97599c2bd76d5d2e2fef56886f2/23620137869.pdfIn PDF document text
    • https://immobilgold.com/file/muzabagepenogagilu.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/86722433075.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/108f25c971c1eca8bf7cf1e9fef528e1/sudusafeniwosilifuxemebom.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/jivuvoponot.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/28336799795.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609f10e182299---80002536614.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67c8f620c3---39684693168.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/65e714abd531f7c9c2aa735390586537/99659360701.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/9c47943a4c64882aada5c93a09fde437/pozaropotiwena.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/movudixoremunat.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_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 16736 bytes
SHA-256: a82eaf2b34d89baba900205f53fad78d36f33f08f35e85aec7021f53f8487615
font_01_sfnt_off0001285e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14075 11336 bytes
SHA-256: abbea7721effdd8b04ccec13b1e02464ea406df10baa3486c7e696df7afba7da

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