Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4475f0155d018d2…

MALICIOUS

PDF

86.1 KB Created: 2021-07-07 21:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aec06f6af2b4fc2b9876a64a82dcd72f SHA-1: a20c9a3539abdb9c4e82c7dc55364adc719fc2eb SHA-256: b4475f0155d018d246a440a3919625155244bfc7747c8d7bb1b42702fd0c1526
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm for phishing or malware delivery. No scripts were extracted, but the presence of numerous external links and the overall detection profile strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=got+me+like+meaning PDF link annotation
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505125903444730.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607963bc63efb---kabavux.pdfIn PDF document text
    • http://wenxuezj.com/images/File/tasarigegot.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/tavumilevanivodimavefer.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/67660937944.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/logepex.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/movs3fk5cih8k836fst473tib6/dewukogomezuviva.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54885799302.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dcbaa0410---gewaf.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/modaxujogolozarumepepo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d171195c8---tiburapaja.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/bbbc9ae3bd40a07447ec1e96b3625898/pubitolafopojenojexu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/974b6iur89ih0vuj0miokjbad2/zatet.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/jezogap.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/pgjts0k4clsqg72e01vhd4jeo3/25977743401.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/60064732100.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f23554e1a1---96415755239.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608519d17b053---dadir.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/92335203621.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160843cd0bb650---99705935729.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160acbcc54b054---1234677270.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a5361424e---34546162311.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/74514697076.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e40ee8ce5---pipibegijepuva.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_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 10312 bytes
SHA-256: 0389248ff1b57d3b05910feed3ce3b7535f88bb87adb334aa1f16e7295c87305
font_01_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 16276 bytes
SHA-256: 474930f8c479b20310d8c63ff2ccd626d83b4a8e1cb48f0e94163da4d6271ede
font_02_sfnt_off00013357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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