Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a7ba5280555a05…

MALICIOUS

PDF

76.7 KB Created: 2021-08-08 06:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f107b025b01f291bf412c7a49b3d97aa SHA-1: 65321ece16ffc5dfe893efa649da010d761673cb SHA-256: 92a7ba5280555a057c7234bf6b4b47e8e4d03379bfe935e40d0c2bffde4faa85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link firing further support this. No scripts were extracted, but the overall structure indicates a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=genel+kimya+1+petrucci+soru+%C3%A7%C3%B6z%C3%BCmleri+pdf PDF link annotation
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e9c7a7089b688358550751be3158cdc6/zadojawawixupi.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210617_7D42F626A8956AB3.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608854c831983---noxuvibupuxifonibeku.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27e0a886a---34662954015.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/pifagakixirekesadoxodo.pdfIn PDF document text
    • https://ksboutlet.com/file/files/miwajimorogimotamotorifa.pdfIn PDF document text
    • https://hse.tw/upload/file/83618172162.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a418fadc2a6---96019993052.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/81331053586.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/df45rkcm51aa6fnumernn031jd/mitukubedikorugedomanofim.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/30870688397.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/vizetowuguk.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/rulekupasaxuwupewar.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5msohibc4cq7ufjuaibb8sg3r0/vudizev.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/18528864176.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/29793536717.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/notekuluxetafifexapuwa.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e20cbcc12104b79a9df317576a12e7e/45500517595.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/fb137e39d4737f7b0ac5d7e4be6908a1/24306626002.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ea3b2664a---sufazetawewupimab.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd1bf32678---95811416842.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/6icde224iu43malslk0b2elfp1/16203141680.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/21982465345.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/69457869526.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_off0000c245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC245 11840 bytes
SHA-256: 049d8e3529dba3c5a32f9ed28df9c1fd2eae9513b31d43c356f8cfe4555dbb6b
font_01_sfnt_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 17992 bytes
SHA-256: 8f3e0b0b6f373e511b4966d2b899e076ad2af99c5fb7e464c85c1a695fef5810
font_02_sfnt_off000109a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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