Malicious PDF — malware analysis report

Static analysis result for SHA-256 367d46a2b7e5e2a9…

MALICIOUS

PDF

83.1 KB Created: 2021-07-04 21:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3440abb9139f5d55e848d63458567ece SHA-1: 9c5fc2eb5cd54d2918d327dd87594930ad16ccdb SHA-256: 367d46a2b7e5e2a9e413bcd32b8a63f745f40058fd1a387f0df4c9bc68700af7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also features a link farm pointing to multiple compromised websites, indicating an attempt to redirect users to potentially harmful destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=find+the+perimeter+of+regular+hexagon+with+each+side+measuring+8m PDF link annotation
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a7bed1a999382c0b28941c030c17297f/15894445064.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/20048351387.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/8941e6be3edf09dc46cfaa3224e33675/12143405955.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66cb9bb68f---gafogagezefinowajiwepuz.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/liriput.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/74920568985.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/20474716669.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/vekovovivebaxanikis.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/regegezixuzupepugezofug.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c159b149c6e---38757395228.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/d4g4hp4teb4pdrenjb5hlc4g7v/58530220239.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/72548214380.pdfIn PDF document text
    • http://jfe.hk/userfiles/96574708014.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/varugeriwuwuwobuwolukise.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/12318f77dfc103a7cb7dd30ec070e24f/92547326087.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/9cb97051b39acbe4758442e7c46bdc62/rakenamafiviz.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/41dfcd1321eefd085ce2151cab858375/wasobigasuzubiz.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/mamuvo.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/46728172686.pdfIn PDF document text
    • https://luminex.pl/upload/file/tasoxexevobo.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/69946671415.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a39a19af729---lozediwuvipom.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_off0000dc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC45 11540 bytes
SHA-256: df4f3d5ee73ddb40a1892202fcbd88d2a7a6e32e67d673d4824c105162fd44f7
font_01_sfnt_off0000f73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 18588 bytes
SHA-256: 550fc4bae384d3d3266ca5f95fba4e04ba63876486ecaa0db4f3d855003c0181
font_02_sfnt_off000126a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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