Malicious PDF — malware analysis report

Static analysis result for SHA-256 1386c71789354075…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 04:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ccaa11c2ee45ff4bfcc80e6ec789a9f SHA-1: 935d88dc07f57dad5209fd99d1e13ba9347019e2 SHA-256: 1386c71789354075dd910bdac4235df5e57b9700234bd626601b7810a5f50e97
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://allycatering.com/userfiles/bizaniledixubisanubafex.pdf In PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119aff939f46---10050324867.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/ad974c0c7e7c61e3ae2322ddd58e2afa/kakanipufakikerema.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/roxemux.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/saxubofarugubazijuniliv.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073b89e3fabd---movazibiposamulaw.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c81b75a1e5---fowap.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/pajitarexup.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/bipolasajeronuliv.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/vowiwesiba.pdfIn PDF document text
    • http://favourtec.com/attachment/file/xavolipusoxipoj.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/vuludifuxupegodifopowa.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/jizezemapulopowusewis.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/14776814008.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/e49i786qenbk9mo2ijq59irg62/11777884067.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/34097371709.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/52399866154.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760e5fe9b6b---vidiwumepejusobepivorik.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfab7308f82---pijupufapugesuzaxozem.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/dufalovapep.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/49e4371d074b7c875dc69375e26e20f9/72734441096.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/kepuw.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/1knmirdmsv10suvn45137h4e26/73247818640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bandwidth+in+data+communication+and+networkingPDF 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_off0000ca55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 10936 bytes
SHA-256: 2705462f0c49f598bc5a49533c2d43ed32043698046b3a7d0ee8395a31c74cc7
font_02_sfnt_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 15876 bytes
SHA-256: 3063e5a1b483d001643813308ce0ef7a1e4f515b974395a1739f267974cd15c8

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