Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e786273677f02ec…

MALICIOUS

PDF

88.6 KB Created: 2021-07-19 00:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 24605bedc6c46777f5a4b4c2ec29a765 SHA-1: 88e1ddc7f1ac42f104248b0b949f66c555801b3e SHA-256: 4e786273677f02ec94856d76e542a75de1356ed6a0bfb54773aa5605aebd4075
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to compromised WordPress uploads, suggesting it's designed to host and distribute malicious files. The presence of AcroForm buttons and a 'download button' heuristic further indicates an attempt to trick the user into downloading content. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/64ae0acb6b57aa085ed93aa01c3714d6/karirilu.pdf In PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607762779bc68---tidadujuxozobiriwunoxor.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/57174362412.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/19eed7bb502307c1b15c1d9aaf3bef4b/vavezaraxul.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/muzowefituvakejege.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/8921779584.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/67653736800322d7321ae34d5db42e82/16731153342.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/860361c01cb890db06340caac54b9f9c/kalubusofawava.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/zagukaditagefag.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942c985caff---waxadevibuteserotovejuv.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/50973189699.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/f24bf470bf3ffd9da88b530904503631/77786646577.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8bqbil3putl7kfl4brn6auo2kg/vakizovijejopuvonetu.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/nurupusizew.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a54f5f8d196---rugiwolekozenu.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/luaql0ldre6nvtgrg7l1ubf7h7/nukavatutiwenojepamejunaz.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/bvt5kl6c00ga80fsmq5kf063cd/kepejilunilaw.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/10192416027.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/q0fgp03qrsh84a1n3msin1nnc1/vefubejutadidiremaj.pdfIn PDF document text
    • http://deforma.it/userfiles/files/tejunizikevaranexesajebiw.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/muroxenukapa.pdfIn PDF document text
    • https://longhoang.vn/upload/files/62726464583.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/lunokogewobonukobodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=best+walking+app+for+iphone+freePDF 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_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 10868 bytes
SHA-256: 489e499ec7f9991bb4899a14e5155b5f21754f35c83d6223105b0aae99ee0023
font_02_sfnt_off0001282e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282E 17364 bytes
SHA-256: 6759eb2a3628ea24891e2faedf6b3b6d76a85f309b5b0d785c787e09582717a0

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