Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d7c3f09ed57da1…

MALICIOUS

PDF

100.9 KB Created: 2021-07-05 18:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fef0df74302b1307189e189fe1d6e86 SHA-1: 93fb2f35a29706cfb4218351a52652afcf491bd3 SHA-256: 25d7c3f09ed57da12d5babc8646f5c126f95c8ed81c75d8fdef86c45a5a33feb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.tif.cn/wp-content/plugins/super-forms/uploads/php/files/kdanllo98ai44k037qmi37slu5/tajigurixajumarunujel.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/ad03cb563e86adfca7f6190ace693c1c/movigoki.pdf
    • https://marljivo.hr/userfiles/file/89564782245.pdf
    • https://foulardfotografando.it/file/xibifib.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/e4d7dd3790747d9010c585911956c785/ruxepovudazarugidipabiva.pdf
    • http://asustainable.com/global/file/xabev.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/72483bbfdfe4fe7dd30e2c2d302c3664/zalelunifizurarijusunu.pdf
    • http://self119.net/upload/userfiles/2021/07/files/210705101711.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b122f0ea07a---16087319686.pdf
    • http://kleiberit.ru/files/file/xinatejaninawetojike.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160712291db6bd---11401959939.pdf
    • http://chinajnbt.com/images/upload/File/mimexuruxexerifuwoger.pdf
    • http://brilspa.ro/userfiles/file///rikukedujifokume.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/90c47c569437ad26eac767cb973dd8ac/nikofibuvuke.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5b61396ae---70255427828.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/da0e1afaa9154bed9bb51c9fa3b5867b/27370258107.pdf
    • http://harasim.cz/uploaded/files/xupomegijitusobimuk.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12cb9927d7---sugadafukikaxizamexadalo.pdf
    • http://vestmorecapital.com/images/epost/37602820018.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e6a78cf990b8b37c54c72bb65fa01caa/nerinetevod.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe1a8d47ca---xulerudonepisef.pdf
    • https://cmsschoolkg.org/userfiles/file/wuwegoguja.pdf
    • https://aadharshilaschool.org/userfiles/file/83535528341.pdf
    • http://gtshotel.it/images/file/73974229644.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16071e6f4a40f2---94022693300.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+outline+method+of+note+taking
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127a7.bin
1a62d2b445c49cf16acac28d38edcce49828a4ac1aed86e90c911b86611a1555
pdf-font-stream PDF embedded font (sfnt) at offset 0x127A7 10688 bytes
font_01_sfnt_off00013fb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB9 16792 bytes
font_02_sfnt_off000157cb.bin
96e76d08918d58f6583ced40901ca8f835fb1185fa6850f63bcc2e20dc4e645b
pdf-font-stream PDF embedded font (sfnt) at offset 0x157CB 17812 bytes