Malicious PDF — malware analysis report

Static analysis result for SHA-256 34166197ad3d87d6…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 22:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed59f59ee9445f22c4b102c3315e0ed9 SHA-1: 5189031540e1e7e52563eeb9357ccb794c20066e SHA-256: 34166197ad3d87d6acd16f481c2ce460070690084197e13706448b03f257cd15
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to various compromised websites and potentially disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a pattern of hosting malicious content on potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/f2f640289936d52d22ae2ff2732186d2/26302163857.pdf In PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbce54cfd3---31686052360.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/26339257966.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e26b8a0748---32608687223.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210908022902.pdfIn PDF document text
    • http://guitarenko.fr/img/files/nubapizirelovegewexepad.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161405f3f3f2b8---budafatuwetujeru.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/45720749099.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/99158809585.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/lufex.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/75321346892.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/70015304879.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/58136712489.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/86090205730.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fee719b87a---37348736987.pdfIn PDF document text
    • http://newbiiz.com/upfiles/file/28425787076.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///5713963704.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/betitapixanefediz.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/wafakutule.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/79606383442.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16308206915188.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/xodonoderepunobajixixami.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/lemazas.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/15545073251.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/88858799705.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/metobutixijas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=palette+api+androidPDF 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_off0000ba95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA95 17292 bytes
SHA-256: 1fad7d066f93a72bccc5ffbc669ad00e60374c91da820614e081d73718198dbf
font_01_sfnt_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 10216 bytes
SHA-256: 926d2ca830d9b132f1b12219f8d87027af14047fb102f48988c46fd0af54953e
font_02_sfnt_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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