Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd65591ef96140c…

MALICIOUS

PDF

91.4 KB Created: 2021-08-08 04:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2e1f8ab3b81b227075b53bc59528e571 SHA-1: 5386c7d4cca7b386243e72b3e5b569a402bfdd01 SHA-256: 4fd65591ef96140c82bbd15718dfd89aa79c72cb28dd6c01dbad981f435164fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple WordPress sites, many of which appear to be compromised, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/19b77bf55dba86994b451334f81d3ad4/57597191919.pdf In PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3070dc7207366287df2c0e2fd0d5d560/63698491744.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080a8a9a8bee---mevabimumawexiromidabefug.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839ffd3f90f---torisazigelimogakiv.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/15f325adbda1088b93f5ec2b35bc8f0b/tunenobobobitejosemeleg.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/timagabazofa.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2cb65c65d9a84885ea3b3fc4acbe5773/toritiminib.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/tomixuvikefujomof.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/pajajizejesebasovegutade.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f3046744c99554aac4187ba7f04795df/60503989424.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/84612567753.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/76870647762.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f1925c51---polakapedalurasegul.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/vga68pqgadber4h4s6tamvvq70/68535606162.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082c34036c6e---lijedujamexowogilolokudel.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160856aa60941f---98763098413.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/58281126255.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5c25925ab---fukuwalupifase.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160afe3363b4fd---62265732323.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/piraliseja.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/jodaxapizas.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/c4cb41cd419c13057620d21bfdedbe57/88333897474.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/fa6e8540686ab5ee8246b6e48a15d15a/56525303044.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd04975d5b---fodutotaduxolu.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/bovagovetunuzimagibij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hidruro+de+potasio+usos+y+aplicacionesPDF 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_off0000ff28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF28 10712 bytes
SHA-256: 4e1349b0c5321279cbb9515c294d012413c171f9636c2345fb6928a57bc108be
font_01_sfnt_off000117d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D7 17808 bytes
SHA-256: ab32cc04a1d195bbcf0488472318ca489312568dbcf363edda0a533c29288d46
font_02_sfnt_off00014590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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