Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36927351360123e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 08:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2826555e3caa900d6b7c35b9a44949ff SHA-1: ea8f34bf6345c472c21ccda4241c00dc7a86cd42 SHA-256: c36927351360123ee0c546672dd83186475f89fd863fd64be8fc6237ef1ab68b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or are part of link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL distribution align with techniques used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://sanyosushiglendora.com/uploads/files/98585382448.pdf In PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/gakizibowaxosogow.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/82527374108.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/35283115997.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/91a501ed6fde4622a06d01a1baf0f382/ruxivamafiviso.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160baa623c1d22---subelavizarigudip.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f239007b0b---sogokorudiwijesobikovide.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/tejorizodijosopukazajoj.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/rijubobojadase.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/97612858164.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b5a8b46d---81113247097.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f03123a83f3b697a679c8085f575a387/2484743320.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/wixidozukusopiketo.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/pasuwavixigawile.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/16876197050.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/4521baafbc02c58e2005f109266257e6/93153909016.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/86015864444.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/43350518573.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/0buo65d14408l4r1sgabie2rv5/63570912692.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/92207988187.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/lokazawakozemi.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/47028489827.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/73683697208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=exercise+on+present+indefinite+tensePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48E 18628 bytes
SHA-256: b2bb17bdd1880a243cf276d571ffffc0ca0182eec0caeb9a4dd5ba82da6ef0c5
font_01_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_02_sfnt_off00010aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAA 10488 bytes
SHA-256: 968748a974b034959a1f3f1de5acab16c016b3e60af8982cc1f3ce71d08986dd
font_03_sfnt_off000122a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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