Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5aac8d898a3204d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 06:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: daf698b96c896de2f2434c0ace3efbf7 SHA-1: c722296deacdef1bf987ebc4b17b729484984610 SHA-256: d5aac8d898a3204df22457a19e77ac85e7e5830bc0414613f800f0ddaa1088b5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wastran.ru/uplcv?utm_term=psp+2019+games PDF link annotation
    • http://studiodugnani.it/userfiles/files/82041815470.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52164606411.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/26030321876.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/16478957014.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/10810657981.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/gunejasomafafivusakon.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa0883cbae---21541273738.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/40297592519.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/a4b6244cb923df922cbc69dac1e86cc5/tudode.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/32464766728.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/siretuxiwomiviloza.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/56822374601.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/dumewifemugukig.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/fufigugijatigu.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/benefonavejo.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/pexetunavoselujimuxapabu.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///lozepuvebalelirosexi.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/71646793770.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3b443937180c68770667fb37829374f9/panunewakuvam.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6b218a781160c93a71f474823c2eadef/86429926309.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/pigimufaz.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/50682110559.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/91536517488.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/35995640092.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/fedefifixefona.pdfIn PDF document text
    • http://redactron.com/userfiles/file/57121499902.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_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 10496 bytes
SHA-256: 6af05dec940922dbc5b828a1fece642adb237deb47fe66b601ef9726635df6fd
font_01_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 17756 bytes
SHA-256: f5140e50a0e3cebcfe59ee3d01e8e7e745b7579c7cda217ba03b71e428ff0497
font_02_sfnt_off000126c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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