Malicious PDF — malware analysis report

Static analysis result for SHA-256 c766b260764e1ad7…

MALICIOUS

PDF

83.9 KB Created: 2021-09-10 01:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c43748a4ae0b54d8665dab9359bd9756 SHA-1: ed28b7b21f148bf394db822ccb3d03a411eabd53 SHA-256: c766b260764e1ad77103aa52e24cd9bd95f1425d8dc9632aba3dd22c79b930f2
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://conexusinternational.com/ckfinder/userfiles/file/tunureluzaxetebu.pdf In PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134247971b7d---dejupefuragu.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/36100148299.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/32284328924.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/tejirobejofijap.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/60072158029.pdfIn PDF document text
    • http://kccmaul.com/files/files/41409993695.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/sizolisinibeduxi.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/57164825335.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/30898409405.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/77397768785.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/devewapojelu.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/5469620207.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/42693467585.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/mibiburopafivukowugu.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/faa85e56c8ab21500789df7b15485790/45245810239.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/cb8564e24fce4eb4730d4d024d37a873/sobikegel.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/siminafikoxe.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/63697002892.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/garivularaxiruxig.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/zebovexijowut.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/pubiroginozazososugafif.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/lulibegaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+automation+testing+frameworkPDF 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_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 10912 bytes
SHA-256: adb7879f6d96ceb3fb9449a30600936c09ce5cbb94834a5da589b6f1fa22af14
font_02_sfnt_off00011037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11037 19628 bytes
SHA-256: a7242546cc1aa628e298378d7e8bf244b09408ee8f0dd0f747c959c866f760e1

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