Malicious PDF — malware analysis report

Static analysis result for SHA-256 717be8c6fc1a1d71…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 21:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5e7160b4e000a17444b8689c398103c SHA-1: 1c2ccf811b31c4df73ef61bbce25d60f42f3bac3 SHA-256: 717be8c6fc1a1d71a155b085461d2a9ecbd2ecca971ea6e0507dc69996978e50
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also includes numerous links to compromised websites, many of which appear to be WordPress installations hosting PDF files, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bc9ead8a6---jasebezolusi.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/16acad2d78e31f3c998d4422ad5e4435/poledopebelasomivam.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/snu9p7rba2bhq2bmdfcc1ak2h9/61395058195.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8302b29da---fujapedukigig.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/zizefuwesisosepusagivodi.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070ef032cdc0---lotosutegonofogijixapufa.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/razikanofaguzenifawamuru.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/54972005569.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbf4bab40cd496aff4ed23fd6cd5076a/16559795840.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160850cb1ad9ef---nipakibimiz.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/56fec5304c0c7d95a445da5f27711fd9/zemovinafenirivuwedosu.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/91573cab76946753a86aca41e15caf9f/80074939501.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/mifesexogeja.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/29868985349.pdfIn PDF document text
    • http://medrea.ru/upload/files/gororaz.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaae254d96---11585701396.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/20939422890.pdfIn PDF document text
    • http://mopron.ru/upload/files/gepejapaletoma.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/dc450a2d0f9fd74f3c903ff2e12a248f/85752467329.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/58129888477.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/nasuzurukinujorej.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/2k49tfvodha7gl95cigkh7aucv/fenadufutiwanukumukuj.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608370217d39c---62073231580.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/72068069207.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607633355edbb---97223159462.pdfPDF link annotation
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abf61619ccb---toxet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=never+enough+piano+accompaniment+pdfPDF 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_off0000d245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD245 10996 bytes
SHA-256: 3c7d3dd323957bf4edef2f8fa0234d8a6465332d1cd58b4c1671a6239336ae00
font_01_sfnt_off0000eb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 17456 bytes
SHA-256: 13221bc6c67fba6ccbfcfe2fc17d9473dff5999d5e76267ee8c7e579354c6a7d
font_02_sfnt_off0001182d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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