Malicious PDF — malware analysis report

Static analysis result for SHA-256 2527b5d65b32cb4d…

MALICIOUS

PDF

93.9 KB Created: 2021-07-19 16:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8d4e47149a6646c23c8bcb19dcd0ccb3 SHA-1: 14c5c6d53ea60b18028aefeb80e77fa7e566946a SHA-256: 2527b5d65b32cb4ddda628096cc21ce2438d852169325a90f9de4552eefa98d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, with several identified as compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/vivojufewurulozofop.pdf In PDF document text
    • http://letresorellebio.it/userfiles/files/bepifuzogumolitosafo.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/78667131310.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/duvupip.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb5337dcfb---tuwujuzefab.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///56992173407.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/takojejidobed.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e45f01120---rujixa.pdfIn PDF document text
    • https://vestol.bg/files/file/41971014238.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a856b2c9---pelepevotepowadi.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d430078aa9---13432764640.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/47874ce69641edc6418486de9d13d1ea/32167129202.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ddcc9ea2e5b84216b9c9480bc38146d6/55226743542.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/99590398205.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a72104971d---9253773104.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/zebolesafeketowej.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/a77034b262f9e77be73280b9af5ea182/64921188735.pdfIn PDF document text
    • https://medius.sk/userfiles/file/rawujazujulinizul.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/17082463633.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/99895732742.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57e8d0d307---26027467204.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/86467010870.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/iurp5503cgkaipcmpt36536peb/sonas.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/65921519700.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/teminaxunir.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/59195730719.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/368007ee80fff8287734c58467f3bed2/dawodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=giblets+of+chickenPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_01_sfnt_off00010a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 17712 bytes
SHA-256: 3e185f7cb04c27bf2c95a2a4ddea67c6b0cf41583e22179f0f5b280caf515469
font_02_sfnt_off000138b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B9 10440 bytes
SHA-256: 7f107d5061ae094d8b9f2f604f90cdd5c623bf939a60f2de537953819ba88f72
font_03_sfnt_off00015059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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