Malicious PDF — malware analysis report

Static analysis result for SHA-256 909e774f8abae606…

MALICIOUS

PDF

86.2 KB Created: 2021-09-03 15:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 832f0a00467e613a48c99ee0658c2b9c SHA-1: cbad7df1c1c9f46d67109ec681248a0e6ea26f8e SHA-256: 909e774f8abae606037ac1847d7b8f6394af05fd786124c8e3aa399012187ce5
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the 'SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://studiophotosfashion.it/userfiles/files/dimalijexuk.pdf In PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/26238487705.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7ifki0u61uu1rr59f34q6u6in5/kelak.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106282003.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/12849832636.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/vm2igf9jnad3ulvuf6r9j8rnk0/92064781389.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/foruvixar.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d140ba0d8eeff48d6669b69b0a46e443/94020833375.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100d517bdb37---redovikaxojilufigonifatob.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccdd13870d---18634125270.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/40054408517.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/bogen.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/zizezebe.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/rimiviriwolelakazizagawo.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/57071070142.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/vekizimivigoxekuvareg.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/92fd07f8bcccf60e21aad0b5da77fb17/duvigowiv.pdfIn PDF document text
    • https://cooperspick.com/files/jasax.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/57368474559.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210720144216_fdtkfh.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/220fbccaac68fff3325ec7fbcb8a7352/butiwisorome.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607d76ad44af3---tilis.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607802996f472---vezenofaribonuzawifefivup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=organic+chemistry+nomenclature+questions+and+answers+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 19064 bytes
SHA-256: aacd641d50046416361a9d4ca8b4dd6d45ac53753f66851638d05e444570c9e2
font_01_sfnt_off00011778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11778 11536 bytes
SHA-256: c9368b7487c2547c963b10ddedae8b6bd144df41c5b38c4cb051853100aed031
font_02_sfnt_off0001323e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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