Malicious PDF — malware analysis report

Static analysis result for SHA-256 595372e8164fffea…

MALICIOUS

PDF

80.0 KB Created: 2021-10-12 00:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a10862e5c5e782be8da451f1e46c12e4 SHA-1: c1513ac202fa8425f447d3e7245e7fd35e903fcc SHA-256: 595372e8164fffea1a166706649b76e036ccb9f262dde7e67e6f17d49fbb5287
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4864

Heuristics 5

  • 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
  • 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://cructi.ru/uplcv?utm_term=fort+jackson+graduation+cancelled PDF link annotation
    • http://pascalparrot.com/uploads/assets/file/20826521808.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/lakikagolise.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/5842692673.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/cu19rogh9eflabhm33v1cksneh/xatimowulu.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210921064241.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202197848285204.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/7503414902.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/keguzajonefe.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/17086539979.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fae7434b010d2b4c42701eb740a2978/56493983781.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/zatufedekixokufawup.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/pokoduguvufuwupuzabazuzur.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6e6e00b35---wotezexoluzarolizimod.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/68858746436.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1614c19245570b---55057097324.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/larus.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/15534728870.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/21651893500.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/temox.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/vuruzamivi.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/voduja.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/zegowikavekutixavawidofox.pdfIn PDF document text
    • http://vlajamo.cz/images/file/gakidulatopatenufo.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161510b9137940---lojuxejefepetotisazamaj.pdfIn 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_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 19632 bytes
SHA-256: 9b9d6ba16cc6a3389af2520829f135cc68219d3b0a691073e2c4a7d5f76702fe
font_01_sfnt_off000110c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DC 10844 bytes
SHA-256: 31ad226c07cda9c63e290d7a3444cee44ec43a415ed59e0146e7dfe0626f0cfc

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