Malicious PDF — malware analysis report

Static analysis result for SHA-256 8deb174ba80223e9…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 17:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b748d3dc0eef8820a286e27e7e5642d SHA-1: 23cf52a1c6c27e29dcb067af4b9c99175734df24 SHA-256: 8deb174ba80223e90e4ab7caaa126e1dbde6cdfac2fda1046adc70d087ae2316
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, all serving PDFs. This structure is indicative of a phishing or malware distribution campaign, likely intended to lure victims into downloading further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://selfmadefilms.nl/userfiles/files/kizonamedevaval.pdf In PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6e9a9128b---bivifokupogexuwabupivig.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-08-09/images/files/31736362744.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/zujawiseb.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/91667989977.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/v11qee3ugob4jdrh35v1kqcsu0/pivexetenaxi.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/48279144551.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/koguredofuwopuko.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/m99g8ivf23aqafmgf21qmaffuo/55297481212.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611f1466e25ca---85898076662.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16086afc06c6f3---19620197189.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/loxeporarelokukoxexijawoj.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/jogofufovojabisonamet.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafd2424cb1---76933397584.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/46998387618.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8d3d7da9e0a15d7ec4ef60a474b4b9eb/nefikugebigoketifaf.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/dekelekatinudotokokumut.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/0d55a2b175366f90cd5b6c649667569e/nadeti.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/18196484827.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/6974369673.pdfIn PDF document text
    • https://plasy.com/uploads/file/wawajuxexowusirejibam.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vst43bisvj4ccc2chgl3d9vsc3/lijutag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=i+will+have+tensePDF 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_off0000e83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 10088 bytes
SHA-256: b87500f57c96689385550c747f7a4ecf80f7a1bc8194fc6ff8cca5b6234493ee
font_01_sfnt_off0000fead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BF 17888 bytes
SHA-256: a1163387914313251d162449a625b8c492f48bd5027e169bcf76e0db3870d750

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