Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8a215396b9ebd1…

MALICIOUS

PDF

92.2 KB Created: 2021-07-01 17:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f5c9fc53ec0ddacfd5cc10b21f7c96a SHA-1: 04702ec9d102de7ad75a8af9bbd958773d742ddb SHA-256: 4f8a215396b9ebd1bb313c571aa9234a799e3dccc3e7ffb7ad47fffa22987ea0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1071.001 Web Protocols T1553.005 Security Software Installation

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external resources, many hosted on compromised or disposable domains, suggesting a link farm designed to lead users to malicious content. The document also contains an explicit instruction to disable security software, a high-risk indicator for phishing or malware delivery. The overall pattern suggests a phishing attempt or a downloader disguised as a benign document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • 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 https://acrgroup.nl/userfiles/file/9631481655.pdf In PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/eb1fb1e9efa0701f2f50a8885e4513b2/86455323836.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/wasopagagal.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/gobovexuguw.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/68561124327.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ed5fadeb916a438e9223810bb15d203a/marosazusepefurumarezagi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/4krb39lb13r5hdk4780ii1buj4/38841456603.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750077de219---79341389373.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/4eb1101b4645174018aec4445032108b/lemesudajogikotu.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b56a67e79---76107994911.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/360c23ff7318f533dcfa79debd396271/mikaxutuwopozivururovi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609747bb90fed---ruziwivonakijuduwo.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/3doc38ip6sn8ug54108osc818r/pemesavalixo.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/22001122190.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/2nroq5a4e722ocad5pcrqngcif/83184707741.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/61552d2cf3427eef82080da7cac0de89/64298466082.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/18954259040ff05c0534bf5700b6d5e5/gegadizupo.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/74336015183.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c0459f57962---9697582179.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/c07b09bcfb388e5d365c203426030a5e/fokes.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/jidetawiporimuj.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/1lpm2m2dgj28151qc4tla7qnmc/70412411755.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/shb9gocbopbkjp6jkk5chjo72n/ruzexetubuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ducktales+remastered+android+downloadPDF 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_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 27124 bytes
SHA-256: 4e1bbbcb89c315e1bb05de957a8807c52a49d225b289657f6e41be3e8304d585
font_01_sfnt_off0001324a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324A 10812 bytes
SHA-256: 578aa424b840e4d942b0a0ca8a144353ff0e1e42c892a93001732d09b45ebadb
font_02_sfnt_off00014b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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