Malicious PDF — malware analysis report

Static analysis result for SHA-256 b827e0cdf120e251…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 12:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ac959540c61f381e92b8f1a68e70b16 SHA-1: e372e0b6689f6dc3012f626bcd9b6ecaeadea973 SHA-256: b827e0cdf120e251d3c28b04303c0382dc5a27fc5e22a2bc8c43914e6400820b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, likely a phishing or redirection attempt. The document body is heavily obfuscated and contains no readable content, suggesting its primary purpose is to host these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/n2ojbq7ov02tgau18hqb414hn0/sepulorogitofukatowuwu.pdf In PDF document text
    • http://sumosushingrill.com/uploads/files/78911676336.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/20215234671.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c68f356046aeb6dad8ca08eaf7d842bb/56979851465.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a09240533b9---solitewegugorunopug.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084e81266b35---lijoritewalidisidekiru.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/jovisunegugebodap.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b7ce2d0f0---91945996044.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/37429619929.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/44139153758.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ch0m31ubgk6ps7374bms08h1no/43534530174.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/eaaaefcecdffa075d4fe4ce0026ea350/96409319921.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/goduvigexenoja.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/92616220497.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/96842278295.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadf94e10b1---butoloxekofowenekoteje.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210811_050046.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/nkn3ltm6uggt2qoukjakbne0m2/xakijusevixerap.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/pigoli.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af92ca8f6fc---49397584730.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/marirorununufikurul.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cf62dbd69---xiluzifilomi.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e86b99d3ee---16380378330.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/ribizuvasupewoperow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cubic+function+graph+pdfPDF 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_off0000cb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8E 18476 bytes
SHA-256: c67384b967fa8deda2c856a89d0952dc71532310148fe348ba5c3c9283a499ed
font_01_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001137c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137C 10824 bytes
SHA-256: f4d0f0106f03dbe543eaaf47496e6dd68d6719fd42fe1ed826a3960a1c526ce2

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