Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f34c927e2760390…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 01:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf771307144a76283559c3e377a10b69 SHA-1: ab9b93bb86956d1135c232c1597b49a41048bcd6 SHA-256: 9f34c927e27603904a8cfd0f7c561a3334e8f3bfb502f2cdd80b7b0bd4e7bfd5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that redirect to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://medvor.ru/uplcv?utm_term=vocabulary+practice+chapter+6+economics+worksheet PDF link annotation
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/ruzudupexitev.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/3966955101.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/21888097355.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/74280587705.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/21876165302.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/44188048340.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/35468092976.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adc5944fa45---wutedukabemiloru.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/3066db56acbbab73a76eedf07bc61f40/pujisozasuta.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/61825324247.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/gesotorew.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/48930592178.pdfIn PDF document text
    • https://carlojans.com/cms/file/gobavageperu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe3a05d27e---mawede.pdfIn PDF document text
    • http://annabarons.lv/files/files/jasazekemef.pdfIn PDF document text
    • http://charivne.info/images/file/bigixekomufumatabu.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/vuxewo.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ea62fa4b---woxewopetakawepafufupa.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/pofisafutabukol.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/zozumawojemulu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0daa9b7ad---27506714976.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/13372921035.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_off0000c0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 11308 bytes
SHA-256: 928f85e5f5fb0ca87c227dd799adf12041b49a8db2f45e7157e46756703237a9
font_02_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 16240 bytes
SHA-256: 25ddd065dd4cef32ea706fc6f15466fe52e8742a682f486c922a83ceda6999f2