Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e3c189134370692…

MALICIOUS

PDF

91.1 KB Created: 2021-07-29 22:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6eb19085fd9999c21ae266dbd70ab788 SHA-1: 78a32067fab135bf7dd955f814ec54437da621cf SHA-256: 0e3c1891343706926dc3cf82061463f5ef5becdfb9e5356370579017603ce70e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple links pointing to compromised WordPress upload storage, indicating an attempt to host and distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via a link farm. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3fbabd41e---45960314180.pdf In PDF document text
    • http://inistor.com/ufiles/files/pifedudiri.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/5535704056.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/23017214758.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6706cc4b58---luvabegekekezubaw.pdfIn PDF document text
    • http://learningkey.org/userfiles/rewevifejozobe.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/34200500947.pdfIn PDF document text
    • http://apvn.info/userfiles/file/mewewuwejudabale.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/84399538141.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/34eae12a7a8a23839ed3eb2a829ed029/favidijivozuxasaxiru.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/616227a6d0975dc35105b3402075c9e4/xuvenekegimurepujiwir.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/wuvibob.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/pewiji.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/60681023823.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/jjsjv4fk5063g32g1856bh0vqb/rodixanilufidarujogox.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/demugog.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd85d1d9dee---tatoropuralilif.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/fajizikilodukola.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079350475f53---zaxipef.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/fusasejufaxijide.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1454dbd4e---25006843176.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/38024786624.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/39edbs1hhi23mueg5kand2f8r3/forinolexevukixa.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xurizabavezesujiwisiji.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/jvqitpmmgq9o04n2fc31n5kqm2/92792743138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=employee+value+proposition+examples+2018PDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/a5885174cd23e0ff9617208315d36b86/6634885902.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_off0000f96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 19112 bytes
SHA-256: 7db30dac285a525a8e7d59a44b6f8c6431d5a58fe33adc7293143164c26069d8
font_01_sfnt_off00012a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14298 11280 bytes
SHA-256: bd11280aeadcfcd2025e4d30fc54f0aef6f59b9a4e30ab20989ba085a3800948